[Red Hat 8] Postfix stop er steeds mee

[Flyduck]

Op me werk heb ik een red hat 8 machine met postfix neergezet tussen internet en onze exhange server.
Het probleem is dat na een paar uur opeens een cleanup process van postfix de hele cpu in beslag neemt (99%), en daarna knalt ie eruit:

Dec 13 14:42:31 spamfilter postfix/master[5579]: warning: process /usr/libexec/postfix/cleanup pid 5696 killed by signal 9

Dec 13 14:42:44 spamfilter postfix/smtpd[5693]: warning: premature end-of-input on public/cleanup socket while reading input attribute name

En na deze meldingen kan ik neer meer connecten op port 25, en moet ik postfix weer opnieuw starten.
Ik draai de laatste release van postfix, iemand een idee waardoor dit kan komen?

[Verwijderd]

Geef eens wat meer logfiles.. /var/log/messages bv.. en een groter deel van mail.log

[Flyduck]

ec 13 15:47:16 spamfilter postfix/smtpd[5707]: warning: timeout on public/cleanup socket while reading input attribute name
Dec 13 15:47:17 spamfilter postfix/cleanup[5718]: warning: connect #2 to subsystem private/rewrite: Connection refused
Dec 13 15:47:17 spamfilter postfix/smtpd[5693]: disconnect from zwaard.nl.uu.net[193.79.237.170]
Dec 13 15:47:39 spamfilter postfix/cleanup[5723]: warning: connect #1 to subsystem private/rewrite: Connection refused
Dec 13 15:47:41 spamfilter postfix/cleanup[5718]: warning: connect #3 to subsystem private/rewrite: Connection refused
Dec 13 15:47:47 spamfilter postfix/cleanup[5725]: warning: connect #2 to subsystem private/rewrite: Connection refused
Dec 13 15:47:48 spamfilter postfix/cleanup[5728]: warning: connect #3 to subsystem private/rewrite: Connection refused
Dec 13 15:47:49 spamfilter postfix/cleanup[5735]: warning: connect #2 to subsystem private/rewrite: Connection refused
Dec 13 15:47:50 spamfilter postfix/cleanup[5723]: warning: connect #2 to subsystem private/rewrite: Connection refused
Dec 13 15:47:51 spamfilter postfix/cleanup[5718]: warning: connect #4 to subsystem private/rewrite: Connection refused
Dec 13 15:47:57 spamfilter postfix/cleanup[5725]: warning: connect #3 to subsystem private/rewrite: Connection refused
Dec 13 15:47:57 spamfilter postfix/smtpd[5713]: warning: timeout on public/cleanup socket while reading input attribute name
Dec 13 15:47:58 spamfilter postfix/cleanup[5728]: warning: connect #4 to subsystem private/rewrite: Connection refused
Dec 13 15:47:59 spamfilter postfix/cleanup[5735]: warning: connect #3 to subsystem private/rewrite: Connection refused
Dec 13 15:48:00 spamfilter postfix/cleanup[5723]: warning: connect #3 to subsystem private/rewrite: Connection refused
Dec 13 15:48:01 spamfilter postfix/cleanup[5718]: warning: connect #5 to subsystem private/rewrite: Connection refused
Dec 13 15:48:02 spamfilter postfix/postfix-script: fatal: the Postfix mail system is not running

uit /var/log/messages
Dec 13 14:42:30 spamfilter kernel: Out of Memory: Killed process 5696 (cleanup).
Dec 13 14:46:36 spamfilter kernel: Out of Memory: Killed process 5697 (cleanup).
Dec 13 14:48:39 spamfilter kernel: Out of Memory: Killed process 5689 (cleanup).
Dec 13 14:50:18 spamfilter sshd(pam_unix)[5738]: session opened for user root by (uid=0)

Hmm daar had ik idd nog niet gekeken. Vreemd er zit zat geheugen in en een swap partition van 400mb