[CentOS] centos email server suddenly much slower. What to do?
laurent at tnpl127.net
Thu Sep 6 21:42:58 UTC 2012
Le 2012-09-06 19:14, Marco Fioretti a écrit :
> I run my own email server for some domains I administer, on a centos
> vps server with a very small number of users.
> The only services are smtp, imap/pop, webmail
> however, there is something that is using "much more memory than
> normal" (see the comment below from the hosting sysadmin after he
> checked user_beancounters). Initially we thought it was apache, but
> even switching it off didn't change anything. What now?
My 2 cents. You probably checked a lot of things.
- a filesystem (almost) full ?
- did you check the logs ? any errors ?
- a user sending/receiving a large e-mail ? what is the maximum size of
an e-mail in your MTA settings ?
- more mail-services-related processes ?
- did you try to stop mail services to see if the server usability is
- do you run antispam and/or antivirus on incoming/outgoing e-mails ?
- to help with DNS, you can probably enable nscd or setup dnsmasq, so
it would reduce DNS queries sent to DNS servers.
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