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Special Forums Cybersecurity how to hide the IP in the email header? Post 7217 by Neo on Thursday 20th of September 2001 11:34:15 PM
Old 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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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)
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