Am 15.03.2014 11:08, schrieb Tim Smith:
> I have a few users who just want their email forwarded onto GMail Accounts 
> however these users seem to receive an
> inordinate amount of spam and so I get a message from Google in my logs 
> stating:
> 
> /Feb  7 09:39:53 xxxxxxx postfix/smtp[15191]: 118C8C0C2A6: host 
> gmail-smtp-in.l.google.com[173.194.78.26] said:
> 421-4.7.0 [xx.xx.xx.xx      15] Our system has detected an unusual rate of 
> 421-4.7.0 unsolicited mail originating
> from your IP address. To protect our 421-4.7.0 users from spam, mail sent 
> from your IP address has been temporarily
> 421-4.7.0 rate limited. Please visit 
> http://www.google.com/mail/help/bulk_mail. 421 4.7.0 html to review our Bulk
> Email Senders Guidelines. fk8si1147119wib.80 - gsmtp (in reply to end of DATA 
> command)/
> 
> That's fine and I totally understand why they do that but is there a way that 
> Postfix can flag the message so that
> Google understands that we are just forwarding the message and that we are 
> not the originator of the spam?

"postfix can flag the message", well it does in it's Received headers but
they can't be used anywhere seriously to classify a message because the
only mailheaders someone can trust are the one generated in his own
network and even then needs to be taken care that faked one from the
internet are removed on the border MTA - so finally no and it does not
matter if you are forwarding or not

if you deliver spam unfiltered you are responsible no matter who is origin

the above is BTW no indication of spam per se, it's a temporary reject
and that messages are delivered later, but if they are *really* spam
you need to find a way REJECT them on your MX for two resons:

* accept and filter after queue makes you to a backscatter
* not filter at all and forward makes you to a spam-source

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