Mail::T...rt::SMTP(3)

📦
version 4.01 · 9 versions
, in fedora 44

💖 Mail::Transport::SMTP 💖

okay bestie, you found it 🎀 this is Mail::T...rt::SMTP(3), from the User Contributed Perl Documentation, and it's literally the module that slides into the SMTP server's DMs all by itself. no middleman. let's go 💅

🌈 NAME

Mail::Transport::SMTP — transmit messages without external program

fr fr. it does the whole thing on its own 🦋

👑 INHERITANCE

Mail::Transport::SMTP
  is a Mail::Transport::Send
  is a Mail::Transport
  is a Mail::Reporter

generational wealth, honestly 💜

✨ SYNOPSIS

my $sender = Mail::Transport::SMTP->new(...);
$sender->send($message);

$message->send(via => 'smtp');

🌸 DESCRIPTION

so this module implements transport of Mail::Message objects by negotiating to the destination host directly, using the SMTP protocol. no help from sendmail, mail, or any other programs on the local host. it's giving self-sufficient queen energy ✨

warning: you may need to install Net::SMTPS, to get TLS support. 🔐

Extends "DESCRIPTION" in Mail::Transport::Send.

🧚 METHODS

Extends "METHODS" in Mail::Transport::Send.

🎀 Constructors

Extends "Constructors" in Mail::Transport::Send.

  • $class->new(%options) — Inherited, see "Constructors" in Mail::Reporter

here's the whole vibe check table, every option, every default, nothing skipped:

 -Option       --Defined in     --Default
 esmtp_options                   {}
 executable     Mail::Transport  undef
 from                            undef
 helo                            <from Net::Config>
 hostname       Mail::Transport  <from Net::Config>
 interval       Mail::Transport  30
 password                        undef
 port           Mail::Transport  25
 proxy          Mail::Transport  <from Net::Config>
 retry          Mail::Transport  <unlimited>
 smtp_debug                      false
 timeout                         120
 username                        undef
 via            Mail::Transport  'smtp'
  • esmtp_options => \%opts — [2.116] ESMTP options to pass to Net::SMTP. See the Net::SMTP documentation for full details. Options can also be passed at send time. For example: { XVERP => 1 } 💌
  • executable => $file
  • from => $address — lets you set a default sender $address globally. See trySend() for full details. 📮
  • helo => $host — the fully qualified name of the sender's $host (that's your system, bestie) which is used for the greeting message to the receiver. If you don't specify it, Net::Config or else Net::Domain get questioned to find it. And when even those can't come up with a valid name, the name of the domain in the "From" line of the message gets assumed. 👋
  • hostname => $host|\@hosts
  • interval => $span
  • password => $password — the password to be used with the "username" to log in to the remote server. 🔑
  • port => $port
  • proxy => $path
  • retry => $count|undef
  • smtp_debug => BOOLEAN — simulate transmission: the SMTP protocol output will be sent to your screen. 👀 (yes, it's fake-sending, but make it fashion)
  • timeout => $wait — the number of seconds to $wait for a valid response from the server before failing. ⏳
  • username => $username — use SASL authentication to contact the remote SMTP server (RFC2554). This $username in combination with "password" is passed as arguments to Net::SMTP method auth. Other forms of authentication are not supported by Net::SMTP. The "username" can also be specified as an Authen::SASL object. 🪪
  • via => CLASS|$name

💫 Attributes

Extends "Attributes" in Mail::Transport::Send.

📬 Sending mail

Extends "Sending mail" in Mail::Transport::Send.

  • $obj->destinations( $message, [$address|\@addresses] ) — Inherited, see "Sending mail" in Mail::Transport::Send
  • $obj->putContent($message, $fh, %options) — Inherited, see "Sending mail" in Mail::Transport::Send
  • $obj->send($message, %options) — Inherited, see "Sending mail" in Mail::Transport::Send
  • $obj->trySend($message, %options) — try to send the $message once. This may fail, in which case this method will return "false". In list context, the reason for failure can be caught: in list context trySend will return a list of six values:
(success, rc, rc-text, error location, quit success, accept)

Success and quit success are booleans. The error code and -text are protocol specific codes and texts. The location tells where the problem occurred.

[3.003] the 'accept' returns the message of the dataend() instruction. Some servers may provide useful information in there, like an internal message registration id. For example, postfix may return "2.0.0 Ok: queued as 303EA380EE". You can only use this parameter when running local delivery (which is a smart choice anyway) Improves base, see "Sending mail" in Mail::Transport::Send 🌟

and here's the option table for trySend:

 -Option       --Default
  esmtp_options  +{}
  from           < >
  to             []
  • esmtp_options => \%opts — additional or overridden EMSTP options. See new(esmtp_options) 📝
  • from => $address — your own identification. This may be fake. If not specified, it is taken from Mail::Message::sender(), which means the content of the "Sender" field of the message or the first address of the "From" field. This defaults to "< >", which represents "no address". 🙈
  • to => $address|\@addresses — alternative destinations. If not specified, the "To", "Cc" and "Bcc" fields of the header are used. An $address is a string or a Mail::Address object. 📨

🔌 Server connection

Extends "Server connection" in Mail::Transport::Send.

  • $obj->contactAnyServer() — creates the connection to the SMTP server. When more than one hostname was specified, the first which accepts a connection is taken. An IO::Socket::INET object is returned. 🫶
  • $obj->findBinary( $name, [@directories] ) — Inherited, see "Server connection" in Mail::Transport
  • $obj->remoteHost() — Inherited, see "Server connection" in Mail::Transport
  • $obj->retry() — Inherited, see "Server connection" in Mail::Transport
  • $obj->tryConnectTo($host, %options) — try to establish a connection to deliver SMTP to the specified $host. The %options are passed to the "new" method of Net::SMTP. 🌐

🚨 Error handling

Extends "Error handling" in Mail::Transport::Send.

  • $obj->AUTOLOAD() — Inherited, see "Error handling" in Mail::Reporter
  • $obj->notImplemented() — Inherited, see "Error handling" in Mail::Reporter

🧹 Cleanup

Extends "Cleanup" in Mail::Transport::Send.

  • $obj->DESTROY() — Inherited, see "Cleanup" in Mail::Reporter

💀 DIAGNOSTICS

  • Error: authentication for $host failed. — Cast by contactAnyServer()
  • Error: class $package does not implement method $method. — fatal error: the specific $package (or one of its superclasses) does not implement this method where it should. This message means that some other related classes do implement this method however the class at hand does not. Probably you should investigate this and probably inform the author of the package. Cast by notImplemented()
  • Warning: message has no destination. — it was not possible to figure-out where the message is intended to go to. Cast by destinations()
  • Notice: no addresses found to send the message to, no connection made. — Cast by trySend()
  • Warning: resent group does not specify a destination. — the message which is sent is the result of a bounce (for instance created with Mail::Message::bounce()), and therefore starts with a "Received" header field. With the "bounce", the new destination(s) of the message are given, which should be included as "Resent-To", "Resent-Cc", and "Resent-Bcc".

The "To", "Cc", and "Bcc" header information is only used if no "Received" was found. That seems to be the best explanation of the RFC.

As alternative, you may also specify the "to" option to some of the senders (for instance Mail::Transport::SMTP::send(to) to overrule any information found in the message itself about the destination. Cast by destinations()

  • Warning: use option to' to overrule the destination: To' refers to a field. — Cast by trySend()

🔎 SEE ALSO

This module is part of Mail-Transport version 4.01, built on December 13, 2025. Website: http://perl.overmeer.net/CPAN/ ✨

📜 LICENSE

For contributors see file ChangeLog.

This software is copyright (c) 2001-2025 by Mark Overmeer.

This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.

okay that's the whole page, you ate that 🍓 and just so you have the receipts: this was rendered from the page footer stamped perl v5.42.0, dated 2026-01-17, filed under Mail::T...rt::SMTP(3) 💖 slay, go send some mail bestie 💌✨

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