postfix-users October 2010 archive
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postfix-users: Re: Mails received with same message id every 15

Re: Mails received with same message id every 15 - 20 seconds

From: Jeroen Geilman <jeroen_at_nospam>
Date: Tue Oct 26 2010 - 17:17:26 GMT
To: postfix-users@postfix.org

On 10/26/2010 01:40 PM, Sharma, Ashish wrote:
> Hi,
>
> I have SpamAssassin integrated on my postfix mail server via 'Amavisd-new'.
>
> The problem that I am facing is that I am receiving same email every 15 second from same sender with same message-ID on my production mail servers, following are my postfix logs:
>
> "Oct 25 01:11:02 g2t0433g postfix/smtpd[6497]: connect from webmail.warwick.net[204.255.24.104]
>
ok.
> Oct 25 01:11:02 g2t0433g postfix/smtpd[6497]: 2EAAF23004C: client=webmail.warwick.net[204.255.24.104]
>
ok.
> Oct 25 01:11:02 g2t0433g postfix/cleanup[6579]: 2EAAF23004C: message-id=<CE130ED7-D498-4461-B076-E3B8AB55B462@warwick.net>
>
ok
> Oct 25 01:11:02 g2t0433g opendkim[17677]: (unknown-jobid): webmail.warwick.net [204.255.24.104] not internal
> Oct 25 01:11:02 g2t0433g opendkim[17677]: (unknown-jobid): not authenticated
> Oct 25 01:11:02 g2t0433g opendkim[17677]: (unknown-jobid): no signing domain match for `warwick.net'
> Oct 25 01:11:02 g2t0433g opendkim[17677]: (unknown-jobid): no signing subdomain match for `warwick.net'
>

not postfix.

> Oct 25 01:11:02 g2t0433g postfix/qmgr[17833]: 2EAAF23004C: from=<peterm@warwick.net>, size=1987, nrcpt=1 (queue active)
>
ok.

> Oct 25 01:11:02 g2t0433g postfix/smtpd[6497]: disconnect from webmail.warwick.net[204.255.24.104]
>
ok.

> Oct 25 01:11:03 g2t0433g amavis[6492]: (06492-09) Passed CLEAN, [204.255.24.104] [204.255.24.104]<peterm@warwick.net> -> <775eejom36ebi@xxx.com>, Message-ID:<CE130ED7-D498-4461-B076-E3B8AB55B462@warwick.net>, mail_id: rJ8M8oQHBzWt, Hits: 1.104, size: 2234, queued_as: 250 Ok, 946 ms
>
not postfix.

> Oct 25 01:11:03 g2t0433g postfix/lmtp[6585]: 2EAAF23004C: to=<775eejom36ebi@xxx.com>, relay=127.0.0.1[127.0.0.1]:10024, delay=1.6, delays=0.6/0/0.01/0.95, dsn=2.6.0, status=sent (250 2.6.0 Ok, id=06492-09, from MTA([127.0.0.1]:10030): 250 Ok)
>
ok.

> Oct 25 01:11:03 g2t0433g postfix/qmgr[17833]: 2EAAF23004C: removed"
>
ok.
> How to determine that such mail is genuine or SPAM?
>

With the normal Spamassassin ruleset, I'd imagine.
You're asking a rather strange question - if ONE of those identical
messages is spam, then they're all spam - they're *identical*.
If one of those messages is NOT spam, then repeating it won't make it spam.

> Is there any rule on spamassassin that I can set that will discard such mails?
>

Probably.

> Right now I have added 'peterm@warwick.net' in my postfix 'main.cf' restriction list as follows:
>
> smtpd_recipient_restrictions =
> check_sender_access hash:/etc/postfix/senderRestrictionList,
> reject_unauth_destination,
> reject_rbl_client zen.spamhaus.org,
> reject_rbl_client bl.spamcop.net
> permit
>
> Is it the right approach?
>

For what ?
What does /etc/postfix/senderRestrictionList do ?
If you want to reject that sender, sure, you can do that there.

-- J.