On Thu, Sep 13, 2007 at 04:54:26AM -0400, Justin Piszcz wrote:
> Aug 20 18:23:36 l2 postfix/smtpd[11969]: NOQUEUE: reject: RCPT from
> smtp2.netcabo.pt[212.113.174.29]: 550 5.7.1
> <[EMAIL PROTECTED]>: Recipient address rejected: Mail appeared to be SPAM or
> forged. Ask your Mail/DNS-Administrator to correct
> HELO and DNS MX settings or to get removed from DNSBLs; MTA helo:
> exch01smtp09.hdi.tvcabo, MTA hostname:
> smtp2.netcabo.pt[212.113.174.29] (helo/hostname mismatch); from=<[EMAIL
> PROTECTED]> to=<[EMAIL PROTECTED]> proto=ESMTP
> helo=<exch01smtp09.hdi.tvcabo>
>
> # VERSION: 0.1.14 beta-6
>
> We see here that the ISP is tvcabo in Portugal but that they are going
> through an exchange server and it passed all of my postfix checks no
> errors, but it died here.
>
> Can we make either an exception for exch* (exhcange hosts) or somehow be
> more careful with this type of mail?
>
> I am not sure of the best approach but just reporting this and asking
> for suggestions.
Two options:
1: increase REJECTLEVEL (with the default it has a score of 1.5, so you'd
have to increase it to at least 1.51, which allows spammers/virus without
RBL listings to come through)
or
2: whitelist the client (domain) cia postfix' check_client_access
or
3: obviously not possible: the remote mta sets smtp2.netcabo.pt as helo.
I don't see any other way, not even SPF lookups would lead to some
improvement.
--
Robert Felber (PGP: 896CF30B)
Munich, Germany
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