Sending a large number of mails causing problems on CentOS 6 / Plesk 10

Posted by papakost on Server Fault See other posts from Server Fault or by papakost
Published on 2012-09-28T09:46:47Z Indexed on 2012/11/30 17:07 UTC
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Filed under:

centos

|

postfix

|

plesk

I have a VPS running CentOS 6. When the system tries to send daily newsletter, after some time (e.g. after sending about 2000 emails), I get error "Unable to send mail" and the system memory goes really high. Till this moment, the mails are delivered normally.

The rest symptoms are:

I cannot see anything on /var/log/maillog (File seems not to be written)
All files on /var/spool/mail have 0 bytes size.
From time to time on httpd log I get errors like: /usr/sbin/sendmail: error while loading shared libraries: libc.so.6: cannot open shared object file: Error 23

"Activate mail service on domain" setting in Plesk is deactivated.

Any idea on what's going wrong here?

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