mail priority by sender

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mail priority by sender
\ Tamas Zseller (16 Jan 2008)

Subject:	mail priority by sender
Group:	Postfix-users
From:	Tamas Zseller
Date:	16 Jan 2008

Hi all,

Sorry if I'm double posting it, I'm a new subscriber and I haven't received my original post, not sure I was already subscribed or not when sending.

I'm facing with the following situation: I'm managing a webserver with multiple virtual domains and with a postfix virtual domain system.
Sometimes a huge amount of newsletters is sent out via PHP (from localhost), unfortunately these mails are not identical per recepient every recipient has it's own queue file.
During this period "normal" mails are shuffled with these newsletters and suffer delay.
What I would like to achieve is to set some kind of priority to these "bulk" newsletters, so that if these newsletters won't be processed until all normal emails are delivered.
More over, if a normal mail arrives, it should be served with higher priority.

I've googled a bit, and I see that some recommends using separate machine or at least instance, but using this method will ease my life much, than configuring another machine. No need to configure all sites with PHP, somebody is using SMTP , etc...

My imaginary algorithm is like this: not to handle newsletters (eg REGEXP: from localhost or from www-data) until there is a normal priority email in the queue.

Is it possible to do it with postfix, and hopefully within one instance?

Thanks in advance

Tamas