Thanks a lot.. this is the solution I was waiting for..

This solved my problem, thanks


On 11/16/2010 12:45 PM, Kenneth Marshall wrote:
I think you need to define an alias-owner for each alias that
needs the members to be tracked individually, like a mailing
list. Otherwise, some batching of addresses is used with the
observed results.

Cheers,
Ken

On Tue, Nov 16, 2010 at 12:37:15PM -0300, Mariel Sebedio wrote:
Here is a better explanation about my problem:

When an e-mail is delivered to an alias, and one or more users in the
alias-list, had their mailbox locked, because they are reading their
mails through dovecot pop3 service, the original mail is delivered to
the members-list that don't have their mailbox locked and the mail gets
deferred. When this happens, the mail gets queued for all the
alias-list, so the users that already received the mail will have a
second copy of it when postfix redelivers the mail.
This will happen all over again until no mailbox is locked.

Here's an example of the logfile

08F1DA6AFE3 1412 Tue Nov 911:53:49us...@xxx.xx.xx
(cannot update mailbox /var/spool/mail/user2 for user user2. unable to
lock for exclusive access: Resource temporarily unavailable)
us...@xxx.xx.xx
(cannot update mailbox /var/spool/mail/user3 for user user3. unable to
lock for exclusive access: Resource temporarily unavailable)
us...@xxx.xx.xx
alias-l...@xxx.xx.xx

How can I avoid this behavior? In fact sendmail resolves this problem
efficiently.

My postconf -n is:

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