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Full Discussion: sendmail : 550 host unknown
Top Forums UNIX for Advanced & Expert Users sendmail : 550 host unknown Post 10310 by Perderabo on Monday 12th of November 2001 02:23:48 PM
Old 11-12-2001
From the FAQS on Sunsolve:
Quote:
Description
Top


Sendmail not working - host unknown.

From Mailer-Daemon ....

550 user@abc.defghjk.com... Host unknown (Name server: abc.defghjk.com:
no data known)

Mail gateway defined with DNS MX record.

nslookup works ok.

mail user@machine.firm.nl works if machine.firm.nl appears as a DNS A
type record.

Solution Summary
Top


As there is no A type record to convert host name to address, you need
to tell sendmail to use DNS name lookup.

In /etc/mail/sendmail.cf in the Options section you need:

# Turn on the DNS name look up
OI

This is included in versions of sendmail.cf supplied with some patches
and included in Solaris 2.6
 

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