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Test ID:
Category:SMTP problems
Title:Sendmail redirection check

The remote SMTP server is vulnerable to a redirection attack. That is, if a
mail is sent to :


Then the remote SMTP server (victim) will happily send the mail to :

Using this flaw, an attacker may route a message through your firewall, in
order to exploit other SMTP servers that can not be reached from the

Solution : In, at the top of ruleset 98, in /etc/,
insert the following statement :
R$*@$*@$* $#error $@ 5.7.1 $: '551 Sorry, no redirections.'

Risk factor : Low

CopyrightThis script is Copyright (C) 1999 Renaud Deraison

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