OOT: Mail rejected with bogus helo
ssilva at sgvwater.com
Wed Apr 16 17:11:11 IST 2008
on 4-16-2008 7:48 AM Matt Kettler spake the following:
> Budi Febrianto wrote:
>> Dear All,
>> I know this OOT, but because many sendmail experts in here, I give it
>> a shot.
>> 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.
> Your system is issuing a HELO in IP format, which is RFC compliant, but
> some view this as a sign a system isn't properly configured and will
> refuse mail from such systems.
> However, more troublesome is your system is issuing a HELO in IP format
> using a private-range non-routable IP, 10.10.16.24. This is blatantly
> bogus when communicating with hosts outside your network, as those hosts
> will never be able to route to 10.10.16.24 and reach your server. (The
> original intent, although outdated, is for the HELO to be usable as a
> hint for where to return mail to if DNS fails to generate a MX or
> implicit MX record. Generating private IPs here is clearly contrary to
To expand on this, just in case the OP is still confused, your private IP helo
is possibly due to running your server natted behind a router. You will have
to modify your servers configuration to give a FQDN or IP that is its natted
> Ultimately, it's up to the administrator of the system you're trying to
> contact to tell you why he's filtering you. Those are purely guesses on
> my part, based on looking at the HELO's your server issued, and general
> knowledge of what some admins do for filtering that not everyone does.
MailScanner is like deodorant...
You hope everybody uses it, and
you notice quickly if they don't!!!!
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