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I have Postfix/Cyrus configuration installed and yesterday I tried to send 500 emails withing 1 min. It seems Postfix blocked and I can't send emails with it. After I run mailq command I saw 475 messages in queue. After 10 ours there are only 417. Can I rush this process? Is there a way to prevent this thing from happening in the future?
I read about my problem on the internet. It seems it's a bug in Postfix. Let's say I want to send 100 emails, with 1 sec pause after each one. The first one is sent and all the other go to mail queue with status/error "delivery temporarily suspended: unknown mail transport error". In 2-3 days all emails are sent, but this is not a good behavior.
Do you think is possible to upgrade Postfix (using yum) without loosing the existing configuration files? I am afraid to update, maybe I will have to reconfigure everything again.