09-21-2001
It is not a just a matter of spoofing the sending IP. SMTP is based on TCP which is connection oriented. The exploit most commonly used is when one or more intermediate SMTP relays are used to relay the mail combined with dirty tricks in the SMTP protocol exchange.
I agree with PxT that there are not too many defensible scenarios to send anonymous email or mask the originating machine. The potential for abuse may far outweigh the benefit for good.
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LEARN ABOUT DEBIAN
email::send::smtp
Email::Send::SMTP(3pm) User Contributed Perl Documentation Email::Send::SMTP(3pm)
NAME
Email::Send::SMTP - Send Messages using SMTP
SYNOPSIS
use Email::Send;
my $mailer = Email::Send->new({mailer => 'SMTP'});
$mailer->mailer_args([Host => 'smtp.example.com:465', ssl => 1])
if $USE_SSL;
$mailer->send($message);
DESCRIPTION
This mailer for "Email::Send" uses "Net::SMTP" to send a message with an SMTP server. The first invocation of "send" requires an SMTP
server arguments. Subsequent calls will remember the the first setting until it is reset.
Any arguments passed to "send" will be passed to "Net::SMTP->new()", with some exceptions. "username" and "password", if passed, are used
to invoke "Net::SMTP->auth()" for SASL authentication support. "ssl", if set to true, turns on SSL support by using "Net::SMTP::SSL".
SMTP can fail for a number of reasons. All return values from this package are true or false. If false, sending has failed. If true, send
succeeded. The return values are "Return::Value" objects, however, and contain more information on just what went wrong.
Here is an example of dealing with failure.
my $return = send SMTP => $message, 'localhost';
die "$return" if ! $return;
The stringified version of the return value will have the text of the error. In a conditional, a failure will evaluate to false.
Here's an example of dealing with success. It is the case that some email addresses may not succeed but others will. In this case, the
return value's "bad" property is set to a list of bad addresses.
my $return = send SMTP => $message, 'localhost';
if ( $return ) {
my @bad = @{ $return->prop('bad') };
warn "Failed to send to: " . join ', ', @bad
if @bad;
}
For more information on these return values, see Return::Value.
ENVELOPE GENERATION
The envelope sender and recipients are, by default, generated by looking at the From, To, Cc, and Bcc headers. This behavior can be
modified by replacing the "get_env_sender" and "get_env_recipients" methods, both of which receive the Email::Simple object and their only
parameter, and return email addresses.
SEE ALSO
Email::Send, Net::SMTP, Net::SMTP::SSL, Email::Address, Return::Value, perl.
AUTHOR
Current maintainer: Ricardo SIGNES, <rjbs@cpan.org>.
Original author: Casey West, <casey@geeknest.com>.
COPYRIGHT
Copyright (c) 2004 Casey West. All rights reserved.
This module is free software; you can redistribute it and/or modify it
under the same terms as Perl itself.
perl v5.12.4 2009-07-12 Email::Send::SMTP(3pm)