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% Documentation by ESR
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\section{Standard Module \module{smtplib}}
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\stmodindex{smtplib}
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\label{module-smtplib}
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\indexii{SMTP}{protocol}
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\index{Simple Mail Transfer Protocol}
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The \module{smtplib} module defines an SMTP client session object that
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can be used to send mail to any Internet machine with an SMTP or ESMTP
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listener daemon. For details of SMTP and ESMTP operation, consult
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\rfc{821} (\emph{Simple Mail Transfer Protocol}) and \rfc{1869}
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(\emph{SMTP Service Extensions}).
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\begin{classdesc}{SMTP}{\optional{host\optional{, port}}}
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A \class{SMTP} instance encapsulates an SMTP connection. It has
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methods that support a full repertoire of SMTP and ESMTP
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operations. If the optional host and port parameters are given, the
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SMTP \method{connect()} method is called with those parameters during
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initialization.
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For normal use, you should only require the initialization/connect,
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\method{sendmail()}, and \method{quit()} methods An example is
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included below.
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\end{classdesc}
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\subsection{SMTP Objects}
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\label{SMTP-objects}
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An \class{SMTP} instance has the following methods:
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\begin{methoddesc}{set_debuglevel}{level}
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Set the debug output level. A true value for \var{level} results in
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debug messages for connection and for all messages sent to and
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received from the server.
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\end{methoddesc}
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\begin{methoddesc}{connect}{\optional{host\optional{, port}}}
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Connect to a host on a given port. The defaults are to connect to the
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local host at the standard SMTP port (25).
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If the hostname ends with a colon (\character{:}) followed by a
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number, that suffix will be stripped off and the number interpreted as
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the port number to use.
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Note: This method is automatically invoked by the constructor if a
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host is specified during instantiation.
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\end{methoddesc}
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\begin{methoddesc}{docmd}{cmd, \optional{, argstring}}
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Send a command \var{cmd} to the server. The optional argument
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\var{argstring} is simply concatenated to the command, separated by a
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space.
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This returns a 2-tuple composed of a numeric response code and the
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actual response line (multiline responses are joined into one long
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line.)
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In normal operation it should not be necessary to call this method
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explicitly. It is used to implement other methods and may be useful
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for testing private extensions.
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\end{methoddesc}
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\begin{methoddesc}{helo}{\optional{hostname}}
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Identify yourself to the SMTP server using \samp{HELO}. The hostname
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argument defaults to the fully qualified domain name of the local
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host.
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In normal operation it should not be necessary to call this method
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explicitly. It will be implicitly called by the \method{sendmail()}
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when necessary.
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\end{methoddesc}
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\begin{methoddesc}{ehlo}{\optional{hostname}}
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Identify yourself to an ESMTP server using \samp{HELO}. The hostname
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argument defaults to the fully qualified domain name of the local
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host. Examine the response for ESMTP option and store them for use by
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\method{has_option()}.
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Unless you wish to use \method{has_option()} before sending
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mail, it should not be necessary to call this method explicitly. It
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will be implicitly called by \method{sendmail()} when necessary.
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\end{methoddesc}
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\begin{methoddesc}{has_option}{name}
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Return \code{1} if \var{name} is in the set of ESMTP options returned
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by the server, \code{0} otherwise. Case is ignored.
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\end{methoddesc}
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\begin{methoddesc}{verify}{address}
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Check the validity of an address on this server using SMTP \samp{VRFY}.
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Returns a tuple consisting of code 250 and a full \rfc{822} address
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(including human name) if the user address is valid. Otherwise returns
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an SMTP error code of 400 or greater and an error string.
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Note: many sites disable SMTP \samp{VRFY} in order to foil spammers.
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\end{methoddesc}
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\begin{methoddesc}{sendmail}{from_addr, to_addrs, msg\optional{, options}}
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Send mail. The required arguments are an \rfc{822} from-address
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string, a list of \rfc{822} to-address strings, and a message string.
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The caller may pass a list of ESMTP options to be used in \samp{MAIL
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FROM} commands as \var{options}.
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If there has been no previous \samp{EHLO} or \samp{HELO} command this
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session, this method tries ESMTP \samp{EHLO} first. If the server does
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ESMTP, message size and each of the specified options will be passed
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to it (if the option is in the feature set the server advertises). If
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\samp{EHLO} fails, \samp{HELO} will be tried and ESMTP options
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suppressed.
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This method will return normally if the mail is accepted for at least
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one recipient. Otherwise it will throw an exception (either
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\exception{SMTPSenderRefused}, \exception{SMTPRecipientsRefused}, or
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\exception{SMTPDataError}). That is, if this method does not throw an
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exception, then someone should get your mail. If this method does not
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throw an exception, it returns a dictionary, with one entry for each
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recipient that was refused.
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\end{methoddesc}
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\begin{methoddesc}{quit}{}
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Terminate the SMTP session and close the connection.
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\end{methoddesc}
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Low-level methods corresponding to the standard SMTP/ESMTP commands
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\samp{HELP}, \samp{RSET}, \samp{NOOP}, \samp{MAIL}, \samp{RCPT}, and
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\samp{DATA} are also supported. Normally these do not need to be
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called directly, so they are not documented here. For details,
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consult the module code.
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\subsection{SMTP Example}
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\label{SMTP-example}
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% really need a little description here...
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\begin{verbatim}
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import sys, rfc822
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def prompt(prompt):
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sys.stdout.write(prompt + ": ")
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return string.strip(sys.stdin.readline())
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fromaddr = prompt("From")
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toaddrs = string.splitfields(prompt("To"), ',')
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print "Enter message, end with ^D:"
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msg = ''
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while 1:
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line = sys.stdin.readline()
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if not line:
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break
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msg = msg + line
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print "Message length is " + `len(msg)`
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server = SMTP('localhost')
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server.set_debuglevel(1)
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server.sendmail(fromaddr, toaddrs, msg)
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server.quit()
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\end{verbatim}
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\begin{seealso}
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\seetext{\rfc{821}, \emph{Simple Mail Transfer Protocol}. Available
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online at \url{http://info.internet.isi.edu/in-notes/rfc/files/rfc821.txt}.}
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\seetext{\rfc{1869}, \emph{SMTP Service Extensions}. Available online
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at \url{http://info.internet.isi.edu/in-notes/rfc/files/rfc1869.txt}.}
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\end{seealso}
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