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I notice a lot of spammy looking e-mails from suspicious sources. They are not real spam but are unsolicited. You can identify them by containing these headers:

X-Mailer-LID: 5
List-Unsubscribe: <http://example.com/unsubscribe.php?M=605065&C=b9fd2d5e30ef6ba9f399d0536f293b69&L=5&N=4>
X-Mailer-RecptId: 605065
X-Mailer-SID: 4
X-Mailer-Sent-By: 1

Does anyone know the software that generates those mails? They are sent out afterwards via real MTAs like Postfix or Exim.

If one could verify the software you can use that information for spam filtering.

1 Answer 1

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Seems to be Interspire Email Marketer:

https://www.interspire.com/forum/showthread.php?t=16759 http://www.interspire.com/emailmarketer/

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  • Doh! Google is my friend.
    – mailq
    Oct 8, 2014 at 10:08
  • @mailq: Yeah, it sent me to this thread and I'm glad about that. :-D Dec 18, 2015 at 12:58

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