I looked at smtp-failure log file and I found my mistake, I have used postfwd to limit the amount of the receipts So I increase its values.

Thanks for your advice,
Mr.Suradet C.

On 06/23/2015 08:26 AM, Mark Sapiro wrote:
On 06/22/2015 02:44 AM, surdet wrote:
I have installed mailman version 2.1.12 with postfix. I have 6 members
of a list. I found some time  mailman send a message to 4 members and 10
minutes later it send a message to 2 members remaining. How can I force
mailman send a message to all members at a time?

Mailman or Postfix? If Postfix is accepting all the recipients, the all
should be delivered at about the same time.

One possibility is Mailman starts delivering to Postfix and the initial
transaction gets Postfix going and it delivers the 4 it's seen to that
point and then goes to sleep for a while before checking it's queue again.

Check your Postfix logs to determine when the messages arrive and when
they are processed. This is likely a Postfix issue.

Also look at Mailman's 'smtp' and 'smtp-failure' logs to see what they
say about delivery times and any retryable failures.


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