Postfix long delivery delay when sending 5000+ mails

Gerald Drouillard gerrylist at
Wed Apr 13 10:09:01 UTC 2011

On 4/13/2011 2:27 AM, Nicolas Barcet wrote:
> 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.
> Nick
Just reduce so you don'ttry to run an 
insane number of email deliveries in parallel.

Gerald Drouillard
Technology Architect
Drouillard&  Associates, Inc.

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