SUMMARY: sendmail doing a DNS lookup

From: Gerhard den Hollander (
Date: Thu Nov 19 1998 - 08:55:07 CST

I asked
> I notice that when I send out an email, sendmail wants to do a DNS
> lookup for the domain of the outgoing email .

> I don't need this how can I turn this off.

I got a variiety of replies, includign a few that said it could not be done
at all.
But the trick is to
A) set the smart relay mailer
   (in /etc/mail/ as )
   # "Smart" relay host (may be null)

B) make sure that mailhost is in your /etc/hosts

Other people suggested adding
to the m4 configuration files, but we have an older version of sendmail.

Many thanks to all who replied (too many to list here).

Kind regards,
Gerhard den Hollander Phone +31-10.280.1515
Technical Support Jason Geosystems BV Fax +31-10.280.1511
Adres: POBox 1573
                                                3000 BN Rotterdam
Visiting Adres: Weena 598
                                                3012 CN Rotterdam The Netherlands
visit us at
"TEAMWARE" for finding Oil & Gas....the smart way

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