Postfix long delivery delay when sending 5000+ mails

Nicolas Barcet nick.barcet at
Wed Apr 13 06:27:05 UTC 2011

On 04/13/2011 03:33 AM, Lox wrote:
> Hello,
> I face a problem on my shared hosting server. I have a user that
> regularly sends some newsletters to about 5000 recipients. When this
> happens, it prevents other user from sending and receiving message for
> more than 12 hours.
> There are many options in postfix so I am not sure which one to tune up
> to prevent such an issue, can anyone advices me on that ?
> Any advices on my postfix (attached) configuration is also greatly
> appreciated...

My solution for this is to have a different postfix server handling the
distribution of mailing lists and newsletters than the one handling my
regular emails.  Mailing list even have their own subdomains
"" so that the mx is handling emails (and bounces)
separately from others.


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