postfix-users October 2010 archive
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postfix-users: Re: Fighting Backscatter

Re: Fighting Backscatter

From: Victor Duchovni <Victor.Duchovni_at_nospam>
Date: Fri Oct 15 2010 - 19:52:12 GMT
To: postfix-users@postfix.org

On Fri, Oct 15, 2010 at 12:47:31PM -0700, Steve Jenkins wrote:

> 2) My server (familyname.com) accepts the message because myaunt@familyname
> is a valid recipient that appears in my virtual aliases file, then forwards
> the message (based on the info in that virtual aliases file) to my aunt's
> actual email address of auntiemildredloveskitties@cox.net
>
> 3) Cox.net rejects the mail because it's SPAM and sends it back to the
> spoofed "sender": innocent@victim.com, basically saying "your message to
> myaunt@familyname.com was rejected because of xyz reason"

No, when they REJECT a message, your server is left with the hot-potato,
and sends the bounce. Bounces are sent by REJECTED MTAs not REJECTING
MTAs, the latter never accept responsibility for the message.

-- Viktor.