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A scenario of this would be something like a domain called domain.com has a mailserver set up that forwards all email sent to [email protected] to [email protected]. If someone sends a lot of spam to [email protected], is my mailserver at domain.com at risk of being blacklisted?

Note: I do not intend to spam, I just want to know if my server would be at risk.

rtheunissen
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    **YES**, there are people who blacklisted because forwarding spam. See these questions: [Postfix forwards to Gmail being rate limited even with unmodified headers](http://serverfault.com/q/658313/218590) and [How can I avoid being classified as spammer when I forward mail to a gmail account?](http://serverfault.com/q/665754/218590) – masegaloeh Mar 02 '15 at 05:00
  • Both of those questions relate to rate limiting issues, which doesn't surprise me at all. My question is specifically about blacklisting. – paranoid-android 13 mins ago – rtheunissen Mar 02 '15 at 05:25
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    In *my opinion*, rate limiting was kind of temporary blacklisting. Anyway, my advice is same: **Don't forward spam** – masegaloeh Mar 02 '15 at 06:04

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Blacklisting and Rate-limiting do work on IP-basis on most cases. Two criteria (of many others) for being blacklisted or - in general - get a bad reputation are:

  • Amount of emails sent
  • Probability that these emails are spam
    • Mail introspection (analysis of the body)
    • no SPF record for the domain used
    • no DKIM used by the mailserver

The latter two are very important for Gmail. If you don't use DKIM you get rate-limited quite fast. Whith DKIM in place, you can send much more mail before being limited.

For your setup, @masegaloeh already linked the relevant threads: Postfix forwards to Gmail being rate limited even with unmodified headers and How can I avoid being classified as spammer when I forward mail to a gmail account?

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sebix
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