OOT: Mail rejected with bogus helo
steve.freegard at fsl.com
Wed Apr 16 10:42:43 IST 2008
Budi Febrianto wrote:
> Dear All,
> I know this OOT, but because many sendmail experts in here, I give it a
> I'm using sendmail-8.13.8-2.el5 with MailScanner 4.65.3.
> Whenever my users sent emails to certain domains, it will rejected with
> this error.
> 553 yyy.yyy.yyy.yyy rejected due to spam, contact 555-505-5555 (bogus
> helo xxx.xxx.xxx.xxx)
> I'm not sure what happen, because I don't have the same problem with
> others domain.
RFC2821 states that the HELO should either by a FQDN or an IP-domain
literal (e.g. [ip.ip.ip.ip]) so a bareword IP address in the HELO that
is not in square brackets is not valid.
So - if you are sending "HELO ip.ip.ip.ip", then that isn't valid, but I
don't think it's possible for Sendmail to sent a HELO in this format as
it always does the right thing.
The command 'sendmail -d0.5 < /dev/null' will show you all the name
variations that sendmail would use in a HELO argument.
I suspect however that in this case it's simply a lame spam filter
that's causing you an issue. Feel free to mail me directly to my
@fsl.com which has strict-helo filtering amongst other things, so being
able to mail me directly without getting an SMTP-time rejection would be
a good way to prove it.
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