On Thu, 25 Feb 2010 21:44:33 +0100
Oscar Mauricio Cruz Lazo <[email protected]> wrote:
> Hi all
>
> I runnig a postfix server but now i notice Emails from my server is being
> blocked by some ISPs because they claim it has a bogus helo,
> I just checked the list and my IP is not listed as a spammer,
>
> this only happens to certain email addresses, 97% of mail still goes through
> fine, just the odd one.
>
> my dns is working good
>
> not sure what is causing this ?
We do this too. Your server is probably not sending a helo that is a
fqdn or the fqdn it is sending is not resolving. Send a message to another
postfix server and look at the log. What does the helo=<SOMETHING> say? What
is your postfix server's $myhostname? If it isn't an FQDN, fix it.
Most mail servers let you get away with breaking the standard here
(which is why you aren't having the problem with everyone), but I advocate
checking this as it blocks a LOT of spam before you have to run it through SA.
Zombied Windows boxes almost never send a valid helo, real mail servers almost
always do. The ones that don't can be fixed.
--TimH
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