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01.23.2008 at 06:55AM PST, ID: 23104463
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7.7

How do I configure the sendmail.mc file so that my sendmail server will prevent harvesting and relay smtp attacks?

Asked by kear67 in SendMail Email Server, Linux Administration, Simple Mail Transfer Protocol (SMTP)

Tags: , , , ,

My ISP called me and noticed an unusual amount of traffic from my mail server.  Most of it seems to be "User Unkown" attack emails as described in the /var/log/maillog.    I'd like to setup sendmail so that the "User Unkown" error message or the "did not issue MAIL/EXPN/VRFY/ETRN during connection to MTA"  error message is never sent back (i.e. just absorbed) from my server to the originating smtp server to prevent these smtp DOS type attacks.  There are too many originating ip's to put the attacking servers in my access.db as REJECTS.Start Free Trial
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This is my current confPRIVACY_FLAGS setting in the /etc/mail/sendmail.mc file
 
define(`confPRIVACY_FLAGS',`authwarnings,noreceipts,goaway,nobodyreturn')dnl
[+][-]01.23.2008 at 12:57PM PST, ID: 20727677

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[+][-]01.24.2008 at 06:47PM PST, ID: 20739665

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[+][-]01.25.2008 at 06:39AM PST, ID: 20742824

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[+][-]01.27.2008 at 05:15PM PST, ID: 20756119

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[+][-]01.30.2008 at 06:43PM PST, ID: 20783481

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[+][-]01.30.2008 at 07:09PM PST, ID: 20783573

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[+][-]03.25.2008 at 09:47AM PDT, ID: 21203651

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[+][-]03.25.2008 at 10:55AM PDT, ID: 21204316

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About this solution

Zones: SendMail Email Server, Linux Administration, Simple Mail Transfer Protocol (SMTP)
Tags: Redhat, Fedora Core, Version 3, sendmail configuration, did not issue MAIL/EXPN/VRFY/ETRN during connection to MTA
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Solution Provided By: kenfcamp
Participating Experts: 3
Solution Grade: A
 
 
 
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20081112-EE-VQP-42 / EE_QW_2_20070628