sendmail problem - Helo command rejected: Host not found

Chuck Swiger cswiger at
Mon Jan 10 16:38:55 PST 2005

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".

You may have to twiddle some more, look at the Makefile there and:

In particular, if your ISP requires your mailer to authenticate, you will need 
to twiddle the things called an access map for SMTP AUTH.  :-)


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