sendmail problem - Helo command rejected: Host not found

Giorgos Keramidas keramida at
Mon Jan 10 18:06:37 PST 2005

On 2005-01-10 19:38, Chuck Swiger <cswiger at> wrote:
>Srot BULL wrote:
>>> The simple answer is that the name your machine claims to be isn't
>>> registered in the DNS, which is normal for dynamic connections.  You
>>> should either relay all email to the mailserver your ISP should have
>>> available, or you should configure your MTA to masquerade as a valid
>>> domain.  The former is likely to better in terms of passing
>>> spam-sensitive mailers.
>> Can I configure my system's sendmail to the above suggestion that you
>> wrote? Or am I stuck to using Evolution/Thunderbird with an SMTP
>> setting and not sendmail as my smtp server?  [...]
> Go to /etc/mail.  Edit (look for SMART_HOST), point it at your
> ISP's mail server.  Do "make stop; make install; make start".

FWIW, the file edited should be `', not `' otherwise
a subsequent "make install" will overwrite the edited `' file
with a fresh copy generated from `'.

To the original poster...

The configuration process of Sendmail can be a bit tricky, but it has
been discussed over and over again in this list.  You may also find it
useful to search the mailing list archives:

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