Please always reply to the list, not individuals.

On 11/8/2012 4:17 AM, 1st WebDesigns wrote:

On 08/11/2012 09:23, Stan Hoeppner wrote:

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On 11/8/2012 2:29 AM, 1st WebDesigns wrote:

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Hi there,

We're using Dovecot version 1.0.7 and Postfix, and since upgrading our Linux box we're getting this in the maillog:

1.0.7 is absolutely ancient and no longer officially supported. You need 1.2.x minimum, 2.x.x even better. And you say you just recently upgraded your Linux distro? What planet do you live on son? You're a few light years behind current stable software.

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Nov 8 07:49:11 server1 postfix/local[27901]: 04B8E7081DA: to=<xyz@xyz.com>, orig_to=<abc@abc.com>, relay=local, delay=19, delays=0.07/0/0/19, dsn=4.2.0, status=deferred (cannot update mailbox /var/spool/mail/abc for user abc. unable to lock for exclusive access: Resource temporarily unavailable)

The simple permanent fix to Postfix/Dovecot mbox locking issues is switching from Postfix LOCAL to Dovecot LDA for mailbox delivery. 1.0.7 is before my time. I do not know if LDA was available then. Upgrade and you'll have it, and you'll also fix other problems you're not even aware of yet.

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Postfix is currently set to: mailbox_delivery_lock = fcntl, dotlock

Dovecot has this: mbox_read_locks = fcntl mbox_write_locks = fcntl dotlock

LDA completely eliminates lock contention.

http://wiki.dovecot.org/LDA/Postfix http://wiki2.dovecot.org/LDA/Postfix

Thanks for your reply. We have upgraded from RHEL4 to RHEL5, so 1.0.7 is the "stable" version that they provide

RHEL 5 is also ancient, released in March 2007, over 5 years ago. The current stable release is RHEL 6.3, released in June 2012. What is the valid reason preventing you from upgrading to the 6.x distribution? The packages in general in 6.x are 5 years newer than 5.x. And given the fact that RHEL runs miles behind the bleeding edge, you're way behind the curve even with a recent RHEL distribution.

You can probably find a much newer version of Dovecot in an RPM somewhere, and Postfix for that matter. But it would be better for you if you simply upgraded to RHEL 6.3.

-- Stan