Sendmail Error Deferred: Resource temporarily unavailable

shawnbishop · 03-16-2006, 03:54 AM

Good Day

I have been running a sendmail Server (Sendmail version 8.13.1, config V10/Berkeley) on CentOS 4.1 for the last year.
Recently the mailq has been holding messages for up to 4 hours,and it is returning a few error messages which I have listed here.
I have gone and checked the sendmail.org site as well as googled/dogpiled the error with no luck

Deferred: Resource temporarily unavailable

host map: lookup (excellanteinternational.com): deferred

Deferred: Name server: mailhost.dmjv.ae.: host name lookup failure

These are the 3 errors that pop up all the time now. I have checked the DNS and it is running and is correct.The Domain names just change with regard to the last 2 errors.
I am stuck and I am thinking of changing to postfix as I cant resolve this problem

Regards

Shawn

gilead · 03-16-2006, 08:56 PM

It looks like your DNS can't resolve the domains. Do you run your own DNS server? If not, your DNS provider may have changed configuration. Also, it may be worth checking to see if the recipients have been having problems with receiving mail from other senders.

If you have the time, you could run a packet capturing tool like ethereal to confirm that the problem is happening with DNS lookups.

The only other thing I could find by googling was related to the maximum number of processes allowed per user. Some setups have increased it from 128 to 512 and had the problem go away.

shawnbishop · 03-19-2006, 02:08 AM

Good Day

When you say

"The only other thing I could find by googling was related to the maximum number of processes allowed per user. Some setups have increased it from 128 to 512 and had the problem go away"

What processes are you talking about?,are these processes in the sendmail setup?

Regards
Shawn

gilead · 03-19-2006, 02:00 PM

That was from the archive of a thread with a similar sounding problem. The posts are at http://archives.neohapsis.com/archiv...0-01/0696.html and http://archives.neohapsis.com/archiv...0-01/0698.html. I suspect it's system processes, not sendmail - but that's a guess.

I've been watching one of my systems under load more carefully recently and although I've seen the load average go over 12, I haven't seen this sort of problem.