Sendmail and resolve.conf

macadam · 06-17-2006, 08:11 AM

Hi,

Yesterday the DNS server stated in the first lineof my resolve.conf file, failed.
Sendmail could not resolve any name and queued the mails.

I had to swap two lines in the resolve.conf file to make it work again.

Does sendmail look only at the first DNS server??? Why can we put 3 servers then, if it does not rotate if one fails???

Regards,

Macadam

penguintutor · 06-21-2006, 08:13 AM

Was the first DNS server entry available, but not working?
Ie. did it respond to queries, but returning host not found?

Multiple DNS servers can be configured so that if one does not answer it will try another, but if the DNS server responds, but does not itself manage to resolve will fail.

A misconfigured DNS server can prevent this from working, just as easy as a bady configured server.

macadam · 06-21-2006, 10:09 AM

Quote:

Originally Posted by penguintutor

Was the first DNS server entry available, but not working?
Ie. did it respond to queries, but returning host not found?

Multiple DNS servers can be configured so that if one does not answer it will try another, but if the DNS server responds, but does not itself manage to resolve will fail.

A misconfigured DNS server can prevent this from working, just as easy as a bady configured server.

Hi, thank you for your answer.
The DNS server was physically down (CPU melt)...and no other DNS was used by sendmail...

Regards,

macadam