Re: special mail queue ?
- On 05/29/2012 04:09 PM, Viktor Dukhovni wrote:
> On Tue, May 29, 2012 at 03:54:19PM +0200, Frank Bonnet wrote:Hello
>> I have a request from staff here.
>> They need to manually post personalized emails to around 100 professors
>> the person who will send those emails wants to verify each email before
>> sending it but all emails have to be send at the same time for
>> administratives reasons ...
>> Is it possible to define a temporary postfix spool queue for that
>> usage to let
>> emails stack in it , then when all emails have been sent and have the OK
>> from staff push the button to send all emails at once ?
> Yes, definitely, just create a Postfix instance in which all mail
> is placed on hold. Then release when ready via:
> # postsuper -H ALL hold # Release from "hold" to "deferred"
> # postqueue -f # Flush the queue
> The hard part is routing selected mail into that instance, either
> the senders can use the custom Postfix as their submission service
> (custom MUA configuration), or you need to route all mail with a
> custom header or subject tag or sender address, ... to the special
> Postfix instance via header_checks or check_sender_access.
> A custom MUA is likely better. You should also consider implementing
> VERP for bounce processing, this can be done via a "simple"
> content filter that invokes sendmail(1) with the appropriate option
> when re-queueing the message. Place messages on hold downstream of
> the filter.
> An advanced (SMTP) filter is more efficient, but is more code if
> you don't already have an engine that does this.
> I've had occasion to implement exactly what you describe (on a
> larger scale) and created the initial implementation of Postfix
> SMTP connection caching to efficiently handle the delivery of a
> burst of pre-queued mail. The throughput was reasonably impressive,
> ~300 msgs/sec per sending machine, with some of the larger ESPs
> receiving over 100 msgs/sec.
Thanks for the answer
I finally choose the lazy way :-)
I've setup a "special" smtp server on a linux box
"just for the event" which HOLD all incoming emails
perfect for what I need.