Yes the bursting is working. We have a Web Server at the same location and routinely pay bursting charges.
What is happening is that the email package sends X number of newsletters to postfix per hour, however, Postfix gets behind very quickly.
Let's say we serve 50K to postfix in the first...
We are experiencing poor performance from Postfix when sending out our corporate email newsletter. We have 450,000 emails that take approximately 9 hours send.
Postfix is running on a Sun Netra T1 105 440 MHz with 512 MB RAM, sitting on a T1 with burstable bandwidth to T3 level.
Any suggestions?
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