class Net::SMTP

What is This Library?¶ ↑

This library provides functionality to send internet mail via SMTP, the Simple Mail Transfer Protocol. For details of SMTP itself, see [RFC2821] (www.ietf.org/rfc/rfc2821.txt).

What is This Library NOT?¶ ↑

This library does NOT provide functions to compose internet mails. You must create them by yourself. If you want better mail support, try RubyMail or TMail or search for alternatives in RubyGems.org or The Ruby Toolbox.

FYI: the official documentation on internet mail is: [RFC2822] (www.ietf.org/rfc/rfc2822.txt).

Examples¶ ↑

Sending Messages¶ ↑

You must open a connection to an SMTP server before sending messages. The first argument is the address of your SMTP server, and the second argument is the port number. Using SMTP.start with a block is the simplest way to do this. This way, the SMTP connection is closed automatically after the block is executed.

require 'net/smtp'
Net::SMTP.start('your.smtp.server', 25) do |smtp|
  # Use the SMTP object smtp only in this block.
end

Replace 'your.smtp.server' with your SMTP server. Normally your system manager or internet provider supplies a server for you.

Then you can send messages.

msgstr = <<END_OF_MESSAGE
From: Your Name <your@mail.address>
To: Destination Address <someone@example.com>
Subject: test message
Date: Sat, 23 Jun 2001 16:26:43 +0900
Message-Id: <unique.message.id.string@example.com>

This is a test message.
END_OF_MESSAGE

require 'net/smtp'
Net::SMTP.start('your.smtp.server', 25) do |smtp|
  smtp.send_message msgstr,
                    'your@mail.address',
                    'his_address@example.com'
end

Closing the Session¶ ↑

You MUST close the SMTP session after sending messages, by calling the finish method:

# using SMTP#finish
smtp = Net::SMTP.start('your.smtp.server', 25)
smtp.send_message msgstr, 'from@address', 'to@address'
smtp.finish

You can also use the block form of SMTP.start/SMTP#start. This closes the SMTP session automatically:

# using block form of SMTP.start
Net::SMTP.start('your.smtp.server', 25) do |smtp|
  smtp.send_message msgstr, 'from@address', 'to@address'
end

I strongly recommend this scheme. This form is simpler and more robust.

HELO domain¶ ↑

In almost all situations, you must provide a third argument to SMTP.start/SMTP#start. This is the domain name which you are on (the host to send mail from). It is called the “HELO domain”. The SMTP server will judge whether it should send or reject the SMTP session by inspecting the HELO domain.

Net::SMTP.start('your.smtp.server', 25,
                'mail.from.domain') { |smtp| ... }

`SMTP` Authentication¶ ↑

The Net::SMTP class supports three authentication schemes; PLAIN, LOGIN and CRAM MD5. (SMTP Authentication: [RFC2554]) To use SMTP authentication, pass extra arguments to SMTP.start/SMTP#start.

# PLAIN
Net::SMTP.start('your.smtp.server', 25, 'mail.from.domain',
                'Your Account', 'Your Password', :plain)
# LOGIN
Net::SMTP.start('your.smtp.server', 25, 'mail.from.domain',
                'Your Account', 'Your Password', :login)

# CRAM MD5
Net::SMTP.start('your.smtp.server', 25, 'mail.from.domain',
                'Your Account', 'Your Password', :cram_md5)

Constants

CRAM_BUFSIZE
DEFAULT_AUTH_TYPE: Authentication
IMASK
OMASK
Revision
VERSION

Attributes

address[R]

The address of the SMTP server to connect to.

esmtp[RW]

Set whether to use ESMTP or not. This should be done before calling start. Note that if start is called in ESMTP mode, and the connection fails due to a ProtocolError, the SMTP object will automatically switch to plain SMTP mode and retry (but not vice versa).

esmtp?[RW]

open_timeout[RW]

Seconds to wait while attempting to open a connection. If the connection cannot be opened within this time, a Net::OpenTimeout is raised. The default value is 30 seconds.

port[R]

The port number of the SMTP server to connect to.

read_timeout[R]

Seconds to wait while reading one block (by one read(2) call). If the read(2) call does not complete within this time, a Net::ReadTimeout is raised. The default value is 60 seconds.

Public Class Methods

default_port() click to toggle source

The default SMTP port number, 25.

# File lib/net/smtp.rb, line 175
def SMTP.default_port
  25
end

default_ssl_context() click to toggle source

# File lib/net/smtp.rb, line 193
def SMTP.default_ssl_context
  OpenSSL::SSL::SSLContext.new
end

default_ssl_port()

Alias for: default_tls_port

default_submission_port() click to toggle source

The default mail submission port number, 587.

# File lib/net/smtp.rb, line 180
def SMTP.default_submission_port
  587
end

default_tls_port() click to toggle source

The default SMTPS port number, 465.

# File lib/net/smtp.rb, line 185
def SMTP.default_tls_port
  465
end

Also aliased as: default_ssl_port

new(address, port = nil) click to toggle source

Creates a new Net::SMTP object.

address is the hostname or ip address of your SMTP server. port is the port to connect to; it defaults to port 25.

This method does not open the TCP connection. You can use SMTP.start instead of SMTP.new if you want to do everything at once. Otherwise, follow SMTP.new with SMTP#start.

# File lib/net/smtp.rb, line 208
def initialize(address, port = nil)
  @address = address
  @port = (port || SMTP.default_port)
  @esmtp = true
  @capabilities = nil
  @socket = nil
  @started = false
  @open_timeout = 30
  @read_timeout = 60
  @error_occurred = false
  @debug_output = nil
  @tls = false
  @starttls = false
  @ssl_context = nil
end

start(address, port = nil, helo = 'localhost', user = nil, secret = nil, authtype = nil) { |smtp| ... } click to toggle source

Creates a new Net::SMTP object and connects to the server.

This method is equivalent to:

Net::SMTP.new(address, port).start(helo_domain, account, password, authtype)

Example¶ ↑

Net::SMTP.start('your.smtp.server') do |smtp|
  smtp.send_message msgstr, 'from@example.com', ['dest@example.com']
end

Block Usage¶ ↑

If called with a block, the newly-opened Net::SMTP object is yielded to the block, and automatically closed when the block finishes. If called without a block, the newly-opened Net::SMTP object is returned to the caller, and it is the caller's responsibility to close it when finished.

Parameters¶ ↑

address is the hostname or ip address of your smtp server.

port is the port to connect to; it defaults to port 25.

helo is the HELO domain provided by the client to the server (see overview comments); it defaults to 'localhost'.

The remaining arguments are used for SMTP authentication, if required or desired. user is the account name; secret is your password or other authentication token; and authtype is the authentication type, one of :plain, :login, or :cram_md5. See the discussion of SMTP Authentication in the overview notes.

Errors¶ ↑

This method may raise:

# File lib/net/smtp.rb, line 452
def SMTP.start(address, port = nil, helo = 'localhost',
               user = nil, secret = nil, authtype = nil,
               &block)   # :yield: smtp
  new(address, port).start(helo, user, secret, authtype, &block)
end

Public Instance Methods

auth_cram_md5(user, secret) click to toggle source

# File lib/net/smtp.rb, line 751
def auth_cram_md5(user, secret)
  check_auth_args user, secret
  res = critical {
    res0 = get_response('AUTH CRAM-MD5')
    check_auth_continue res0
    crammed = cram_md5_response(secret, res0.cram_md5_challenge)
    get_response(base64_encode("#{user} #{crammed}"))
  }
  check_auth_response res
  res
end

auth_login(user, secret) click to toggle source

# File lib/net/smtp.rb, line 740
def auth_login(user, secret)
  check_auth_args user, secret
  res = critical {
    check_auth_continue get_response('AUTH LOGIN')
    check_auth_continue get_response(base64_encode(user))
    get_response(base64_encode(secret))
  }
  check_auth_response res
  res
end

auth_plain(user, secret) click to toggle source

# File lib/net/smtp.rb, line 731
def auth_plain(user, secret)
  check_auth_args user, secret
  res = critical {
    get_response('AUTH PLAIN ' + base64_encode("\0#{user}\0#{secret}"))
  }
  check_auth_response res
  res
end

authenticate(user, secret, authtype = DEFAULT_AUTH_TYPE) click to toggle source

# File lib/net/smtp.rb, line 725
def authenticate(user, secret, authtype = DEFAULT_AUTH_TYPE)
  check_auth_method authtype
  check_auth_args user, secret
  send auth_method(authtype), user, secret
end

capable_auth_types() click to toggle source

Returns supported authentication methods on this server. You cannot get valid value before opening SMTP session.

# File lib/net/smtp.rb, line 280
def capable_auth_types
  return [] unless @capabilities
  return [] unless @capabilities['AUTH']
  @capabilities['AUTH']
end

capable_cram_md5_auth?() click to toggle source

true if server advertises AUTH CRAM-MD5. You cannot get valid value before opening SMTP session.

# File lib/net/smtp.rb, line 267
def capable_cram_md5_auth?
  auth_capable?('CRAM-MD5')
end

capable_login_auth?() click to toggle source

true if server advertises AUTH LOGIN. You cannot get valid value before opening SMTP session.

# File lib/net/smtp.rb, line 261
def capable_login_auth?
  auth_capable?('LOGIN')
end

capable_plain_auth?() click to toggle source

true if server advertises AUTH PLAIN. You cannot get valid value before opening SMTP session.

# File lib/net/smtp.rb, line 255
def capable_plain_auth?
  auth_capable?('PLAIN')
end

capable_starttls?() click to toggle source

true if server advertises STARTTLS. You cannot get valid value before opening SMTP session.

# File lib/net/smtp.rb, line 243
def capable_starttls?
  capable?('STARTTLS')
end

data(msgstr = nil) { |stream| ... } click to toggle source

This method sends a message. If msgstr is given, sends it as a message. If block is given, yield a message writer stream. You must write message before the block is closed.

# Example 1 (by string)
smtp.data(<<EndMessage)
From: john@example.com
To: betty@example.com
Subject: I found a bug

Check vm.c:58879.
EndMessage

# Example 2 (by block)
smtp.data {|f|
  f.puts "From: john@example.com"
  f.puts "To: betty@example.com"
  f.puts "Subject: I found a bug"
  f.puts ""
  f.puts "Check vm.c:58879."
}

# File lib/net/smtp.rb, line 885
def data(msgstr = nil, &block)   #:yield: stream
  if msgstr and block
    raise ArgumentError, "message and block are exclusive"
  end
  unless msgstr or block
    raise ArgumentError, "message or block is required"
  end
  res = critical {
    check_continue get_response('DATA')
    socket_sync_bak = @socket.io.sync
    begin
      @socket.io.sync = false
      if msgstr
        @socket.write_message msgstr
      else
        @socket.write_message_by_block(&block)
      end
    ensure
      @socket.io.flush
      @socket.io.sync = socket_sync_bak
    end
    recv_response()
  }
  check_response res
  res
end

debug_output=(arg) click to toggle source

WARNING: This method causes serious security holes. Use this method for only debugging.

Set an output stream for debug logging. You must call this before start.

# example
smtp = Net::SMTP.new(addr, port)
smtp.set_debug_output $stderr
smtp.start do |smtp|
  ....
end

# File lib/net/smtp.rb, line 393
def debug_output=(arg)
  @debug_output = arg
end

Also aliased as: set_debug_output

disable_ssl()

Alias for: disable_tls

disable_starttls() click to toggle source

Disables SMTP/TLS (STARTTLS) for this object. Must be called before the connection is established to have any effect.

# File lib/net/smtp.rb, line 351
def disable_starttls
  @starttls = false
  @ssl_context = nil
end

disable_tls() click to toggle source

Disables SMTP/TLS for this object. Must be called before the connection is established to have any effect.

# File lib/net/smtp.rb, line 307
def disable_tls
  @tls = false
  @ssl_context = nil
end

Also aliased as: disable_ssl

ehlo(domain) click to toggle source

# File lib/net/smtp.rb, line 829
def ehlo(domain)
  getok("EHLO #{domain}")
end

enable_ssl(context = SMTP.default_ssl_context)

Alias for: enable_tls

enable_starttls(context = SMTP.default_ssl_context) click to toggle source

Enables SMTP/TLS (STARTTLS) for this object. context is a OpenSSL::SSL::SSLContext object.

# File lib/net/smtp.rb, line 333
def enable_starttls(context = SMTP.default_ssl_context)
  raise 'openssl library not installed' unless defined?(OpenSSL)
  raise ArgumentError, "SMTPS and STARTTLS is exclusive" if @tls
  @starttls = :always
  @ssl_context = context
end

enable_starttls_auto(context = SMTP.default_ssl_context) click to toggle source

Enables SMTP/TLS (STARTTLS) for this object if server accepts. context is a OpenSSL::SSL::SSLContext object.

# File lib/net/smtp.rb, line 342
def enable_starttls_auto(context = SMTP.default_ssl_context)
  raise 'openssl library not installed' unless defined?(OpenSSL)
  raise ArgumentError, "SMTPS and STARTTLS is exclusive" if @tls
  @starttls = :auto
  @ssl_context = context
end

enable_tls(context = SMTP.default_ssl_context) click to toggle source

Enables SMTP/TLS (SMTPS: SMTP over direct TLS connection) for this object. Must be called before the connection is established to have any effect. context is a OpenSSL::SSL::SSLContext object.

# File lib/net/smtp.rb, line 296
def enable_tls(context = SMTP.default_ssl_context)
  raise 'openssl library not installed' unless defined?(OpenSSL)
  raise ArgumentError, "SMTPS and STARTTLS is exclusive" if @starttls
  @tls = true
  @ssl_context = context
end

Also aliased as: enable_ssl

finish() click to toggle source

Finishes the SMTP session and closes TCP connection. Raises IOError if not started.

# File lib/net/smtp.rb, line 531
def finish
  raise IOError, 'not yet started' unless started?
  do_finish
end

helo(domain) click to toggle source

# File lib/net/smtp.rb, line 825
def helo(domain)
  getok("HELO #{domain}")
end

inspect() click to toggle source

Provide human-readable stringification of class state.

# File lib/net/smtp.rb, line 225
def inspect
  "#<#{self.class} #{@address}:#{@port} started=#{@started}>"
end

mailfrom(from_addr) click to toggle source

# File lib/net/smtp.rb, line 833
def mailfrom(from_addr)
  getok("MAIL FROM:<#{from_addr}>")
end

open_message_stream(from_addr, *to_addrs) { |stream| ... } click to toggle source

Opens a message writer stream and gives it to the block. The stream is valid only in the block, and has these methods:

puts(str = ''): outputs STR and CR LF.
print(str): outputs STR.
printf(fmt, *args): outputs sprintf(fmt,*args).
write(str): outputs STR and returns the length of written bytes.
<<(str): outputs STR and returns self.

If a single CR (“r”) or LF (“n”) is found in the message, it is converted to the CR LF pair. You cannot send a binary message with this method.

Parameters¶ ↑

from_addr is a String representing the source mail address.

to_addr is a String or Strings or Array of Strings, representing the destination mail address or addresses.

Example¶ ↑

Net::SMTP.start('smtp.example.com', 25) do |smtp|
  smtp.open_message_stream('from@example.com', ['dest@example.com']) do |f|
    f.puts 'From: from@example.com'
    f.puts 'To: dest@example.com'
    f.puts 'Subject: test message'
    f.puts
    f.puts 'This is a test message.'
  end
end

Errors¶ ↑

This method may raise:

# File lib/net/smtp.rb, line 709
def open_message_stream(from_addr, *to_addrs, &block)   # :yield: stream
  raise IOError, 'closed session' unless @socket
  mailfrom from_addr
  rcptto_list(to_addrs) {data(&block)}
end

Also aliased as: ready

quit() click to toggle source

# File lib/net/smtp.rb, line 912
def quit
  getok('QUIT')
end

rcptto(to_addr) click to toggle source

# File lib/net/smtp.rb, line 858
def rcptto(to_addr)
  getok("RCPT TO:<#{to_addr}>")
end

rcptto_list(to_addrs) { || ... } click to toggle source

# File lib/net/smtp.rb, line 837
def rcptto_list(to_addrs)
  raise ArgumentError, 'mail destination not given' if to_addrs.empty?
  ok_users = []
  unknown_users = []
  to_addrs.flatten.each do |addr|
    begin
      rcptto addr
    rescue SMTPAuthenticationError
      unknown_users << addr.dump
    else
      ok_users << addr
    end
  end
  raise ArgumentError, 'mail destination not given' if ok_users.empty?
  ret = yield
  unless unknown_users.empty?
    raise SMTPAuthenticationError, "failed to deliver for #{unknown_users.join(', ')}"
  end
  ret
end

read_timeout=(sec) click to toggle source

Set the number of seconds to wait until timing-out a read(2) call.

# File lib/net/smtp.rb, line 374
def read_timeout=(sec)
  @socket.read_timeout = sec if @socket
  @read_timeout = sec
end

ready(from_addr, *to_addrs)

Alias for: open_message_stream

rset() click to toggle source

Aborts the current mail transaction

# File lib/net/smtp.rb, line 817
def rset
  getok('RSET')
end

send_mail(msgstr, from_addr, *to_addrs)

Alias for: send_message

send_message(msgstr, from_addr, *to_addrs) click to toggle source

Sends msgstr as a message. Single CR (“r”) and LF (“n”) found in the msgstr, are converted into the CR LF pair. You cannot send a binary message with this method. msgstr should include both the message headers and body.

from_addr is a String representing the source mail address.

to_addr is a String or Strings or Array of Strings, representing the destination mail address or addresses.

Example¶ ↑

Net::SMTP.start('smtp.example.com') do |smtp|
  smtp.send_message msgstr,
                    'from@example.com',
                    ['dest@example.com', 'dest2@example.com']
end

Errors¶ ↑

This method may raise:

# File lib/net/smtp.rb, line 656
def send_message(msgstr, from_addr, *to_addrs)
  raise IOError, 'closed session' unless @socket
  mailfrom from_addr
  rcptto_list(to_addrs) {data msgstr}
end

Also aliased as: send_mail, sendmail

sendmail(msgstr, from_addr, *to_addrs)

Alias for: send_message

set_debug_output(arg)

Alias for: debug_output=

ssl?()

Alias for: tls?

start(helo = 'localhost', user = nil, secret = nil, authtype = nil) { |smtp| ... } click to toggle source

Opens a TCP connection and starts the SMTP session.

Parameters¶ ↑

helo is the HELO domain that you'll dispatch mails from; see the discussion in the overview notes.

If both of user and secret are given, SMTP authentication will be attempted using the AUTH command. authtype specifies the type of authentication to attempt; it must be one of :login, :plain, and :cram_md5. See the notes on SMTP Authentication in the overview.

Block Usage¶ ↑

When this methods is called with a block, the newly-started SMTP object is yielded to the block, and automatically closed after the block call finishes. Otherwise, it is the caller's responsibility to close the session when finished.

Example¶ ↑

This is very similar to the class method SMTP.start.

require 'net/smtp'
smtp = Net::SMTP.new('smtp.mail.server', 25)
smtp.start(helo_domain, account, password, authtype) do |smtp|
  smtp.send_message msgstr, 'from@example.com', ['dest@example.com']
end

The primary use of this method (as opposed to SMTP.start) is probably to set debugging (set_debug_output) or ESMTP (esmtp=), which must be done before the session is started.

Errors¶ ↑

If session has already been started, an IOError will be raised.

This method may raise:

# File lib/net/smtp.rb, line 514
def start(helo = 'localhost',
          user = nil, secret = nil, authtype = nil)   # :yield: smtp
  if block_given?
    begin
      do_start helo, user, secret, authtype
      return yield(self)
    ensure
      do_finish
    end
  else
    do_start helo, user, secret, authtype
    return self
  end
end

started?() click to toggle source

true if the SMTP session has been started.

# File lib/net/smtp.rb, line 459
def started?
  @started
end

starttls() click to toggle source

# File lib/net/smtp.rb, line 821
def starttls
  getok('STARTTLS')
end

starttls?() click to toggle source

Returns truth value if this object uses STARTTLS. If this object always uses STARTTLS, returns :always. If this object uses STARTTLS when the server support TLS, returns :auto.

# File lib/net/smtp.rb, line 317
def starttls?
  @starttls
end

starttls_always?() click to toggle source

true if this object uses STARTTLS.

# File lib/net/smtp.rb, line 322
def starttls_always?
  @starttls == :always
end

starttls_auto?() click to toggle source

true if this object uses STARTTLS when server advertises STARTTLS.

# File lib/net/smtp.rb, line 327
def starttls_auto?
  @starttls == :auto
end

tls?() click to toggle source

true if this object uses SMTP/TLS (SMTPS).

# File lib/net/smtp.rb, line 287
def tls?
  @tls
end

Also aliased as: ssl?

Private Instance Methods

auth_capable?(type) click to toggle source

# File lib/net/smtp.rb, line 271
def auth_capable?(type)
  return nil unless @capabilities
  return false unless @capabilities['AUTH']
  @capabilities['AUTH'].include?(type)
end

auth_method(type) click to toggle source

# File lib/net/smtp.rb, line 771
def auth_method(type)
  "auth_#{type.to_s.downcase}".intern
end

base64_encode(str) click to toggle source

# File lib/net/smtp.rb, line 784
def base64_encode(str)
  # expects "str" may not become too long
  [str].pack('m0')
end

capable?(key) click to toggle source

# File lib/net/smtp.rb, line 247
def capable?(key)
  return nil unless @capabilities
  @capabilities[key] ? true : false
end

check_auth_args(user, secret, authtype = DEFAULT_AUTH_TYPE) click to toggle source

# File lib/net/smtp.rb, line 775
def check_auth_args(user, secret, authtype = DEFAULT_AUTH_TYPE)
  unless user
    raise ArgumentError, 'SMTP-AUTH requested but missing user name'
  end
  unless secret
    raise ArgumentError, 'SMTP-AUTH requested but missing secret phrase'
  end
end

check_auth_continue(res) click to toggle source

# File lib/net/smtp.rb, line 979
def check_auth_continue(res)
  unless res.continue?
    raise res.exception_class, res.message
  end
end

check_auth_method(type) click to toggle source

# File lib/net/smtp.rb, line 765
def check_auth_method(type)
  unless respond_to?(auth_method(type), true)
    raise ArgumentError, "wrong authentication type #{type}"
  end
end

check_auth_response(res) click to toggle source

# File lib/net/smtp.rb, line 973
def check_auth_response(res)
  unless res.success?
    raise SMTPAuthenticationError, res.message
  end
end

check_continue(res) click to toggle source

# File lib/net/smtp.rb, line 967
def check_continue(res)
  unless res.continue?
    raise SMTPUnknownError, "could not get 3xx (#{res.status}: #{res.string})"
  end
end

check_response(res) click to toggle source

# File lib/net/smtp.rb, line 961
def check_response(res)
  unless res.success?
    raise res.exception_class, res.message
  end
end

cram_md5_response(secret, challenge) click to toggle source

CRAM-MD5: [RFC2195]

# File lib/net/smtp.rb, line 793
def cram_md5_response(secret, challenge)
  tmp = Digest::MD5.digest(cram_secret(secret, IMASK) + challenge)
  Digest::MD5.hexdigest(cram_secret(secret, OMASK) + tmp)
end

cram_secret(secret, mask) click to toggle source

# File lib/net/smtp.rb, line 800
def cram_secret(secret, mask)
  secret = Digest::MD5.digest(secret) if secret.size > CRAM_BUFSIZE
  buf = secret.ljust(CRAM_BUFSIZE, "\0")
  0.upto(buf.size - 1) do |i|
    buf[i] = (buf[i].ord ^ mask).chr
  end
  buf
end

critical() { || ... } click to toggle source

# File lib/net/smtp.rb, line 951
def critical
  return Response.parse('200 dummy reply code') if @error_occurred
  begin
    return yield()
  rescue Exception
    @error_occurred = true
    raise
  end
end

do_finish() click to toggle source

# File lib/net/smtp.rb, line 611
def do_finish
  quit if @socket and not @socket.closed? and not @error_occurred
ensure
  @started = false
  @error_occurred = false
  @socket.close if @socket
  @socket = nil
end

do_helo(helo_domain) click to toggle source

# File lib/net/smtp.rb, line 599
def do_helo(helo_domain)
  res = @esmtp ? ehlo(helo_domain) : helo(helo_domain)
  @capabilities = res.capabilities
rescue SMTPError
  if @esmtp
    @esmtp = false
    @error_occurred = false
    retry
  end
  raise
end

do_start(helo_domain, user, secret, authtype) click to toggle source

# File lib/net/smtp.rb, line 542
def do_start(helo_domain, user, secret, authtype)
  raise IOError, 'SMTP session already started' if @started
  if user or secret
    check_auth_method(authtype || DEFAULT_AUTH_TYPE)
    check_auth_args user, secret
  end
  s = Timeout.timeout(@open_timeout, Net::OpenTimeout) do
    tcp_socket(@address, @port)
  end
  logging "Connection opened: #{@address}:#{@port}"
  @socket = new_internet_message_io(tls? ? tlsconnect(s) : s)
  check_response critical { recv_response() }
  do_helo helo_domain
  if starttls_always? or (capable_starttls? and starttls_auto?)
    unless capable_starttls?
      raise SMTPUnsupportedCommand,
          "STARTTLS is not supported on this server"
    end
    starttls
    @socket = new_internet_message_io(tlsconnect(s))
    # helo response may be different after STARTTLS
    do_helo helo_domain
  end
  authenticate user, secret, (authtype || DEFAULT_AUTH_TYPE) if user
  @started = true
ensure
  unless @started
    # authentication failed, cancel connection.
    s.close if s
    @socket = nil
  end
end

get_response(reqline) click to toggle source

# File lib/net/smtp.rb, line 935
def get_response(reqline)
  validate_line reqline
  @socket.writeline reqline
  recv_response()
end

getok(reqline) click to toggle source

# File lib/net/smtp.rb, line 925
def getok(reqline)
  validate_line reqline
  res = critical {
    @socket.writeline reqline
    recv_response()
  }
  check_response res
  res
end

logging(msg) click to toggle source

# File lib/net/smtp.rb, line 1064
def logging(msg)
  @debug_output << msg + "\n" if @debug_output
end

new_internet_message_io(s) click to toggle source

# File lib/net/smtp.rb, line 594
def new_internet_message_io(s)
  InternetMessageIO.new(s, read_timeout: @read_timeout,
                        debug_output: @debug_output)
end

recv_response() click to toggle source

# File lib/net/smtp.rb, line 941
def recv_response
  buf = ''.dup
  while true
    line = @socket.readline
    buf << line << "\n"
    break unless line[3,1] == '-'   # "210-PIPELINING"
  end
  Response.parse(buf)
end

ssl_socket(socket, context) click to toggle source

# File lib/net/smtp.rb, line 575
def ssl_socket(socket, context)
  OpenSSL::SSL::SSLSocket.new socket, context
end

tcp_socket(address, port) click to toggle source

# File lib/net/smtp.rb, line 538
def tcp_socket(address, port)
  TCPSocket.open address, port
end

tlsconnect(s) click to toggle source

# File lib/net/smtp.rb, line 579
def tlsconnect(s)
  verified = false
  s = ssl_socket(s, @ssl_context)
  logging "TLS connection started"
  s.sync_close = true
  ssl_socket_connect(s, @open_timeout)
  if @ssl_context.verify_mode != OpenSSL::SSL::VERIFY_NONE
    s.post_connection_check(@address)
  end
  verified = true
  s
ensure
  s.close unless verified
end

validate_line(line) click to toggle source

# File lib/net/smtp.rb, line 918
def validate_line(line)
  # A bare CR or LF is not allowed in RFC5321.
  if /[\r\n]/ =~ line
    raise ArgumentError, "A line must not contain CR or LF"
  end
end

class Net::SMTP

What is This Library?¶ ↑

What is This Library NOT?¶ ↑

Examples¶ ↑

Sending Messages¶ ↑

Closing the Session¶ ↑

HELO domain¶ ↑

SMTP Authentication¶ ↑

Example¶ ↑

Block Usage¶ ↑

Parameters¶ ↑

Errors¶ ↑

Parameters¶ ↑

Example¶ ↑

Errors¶ ↑

Example¶ ↑

Errors¶ ↑

Parameters¶ ↑

Block Usage¶ ↑

Example¶ ↑

Errors¶ ↑

`SMTP` Authentication¶ ↑