M?rcio Luciano Donada:
> Hi lists,
> I am with problem in my line of e-mails (postqueue-p) and the line only
> grows. I wonder, what parameters to performance that I can use to
> improve the delivery of e-mail and download this queue. Below my
> configuration:
Wietse:
> General recommendation: delete all those tweaks that you made,
> then present maillog statistics that show what the nature of
> the performance problem is.
M?rcio Luciano Donada:
> Thank you for your cooperation. I can not understand is why my domain is
> with this problem of slow delivery and many e-mail in the queue:
>
> T 5 10 20 40 80 160 320 640 1280 1280+
> TOTAL 545 284 135 126 0 0 0 0 0 0 0
> xxx.com.br 343 187 87 69 0 0 0 0 0 0 0
>
> Can not find my problem. We have a fiber link with the operator to 10Mb
> Internet connection.
It is always possible to create email faster than you can send it
out over the Internet. Some hosts will be down, other hosts will
limit the flow of email from strangers. Such information can be
mined from the Postfix "status=xxx" and "delays=a/b/c/d" logging.
The status is either "ok", "deferred" or "bounced". If a non-trivial
portion of mail is deferred you need to fix that problem. Raising
the output concurrency or connection caching won't help fixing that.
With the delays=a/b/c/d logging, "a" is the time in queue before
Postfix selects the message for delivery, "b" is time waiting in
active queue, "c" is time to set up an SMTP connection, and "d"
the time to send the mail over that connection. If delays have a
large "b" then your queue has lots of mail for one slow destination
(xxx.com.br) and you need to fix that problem. If delays have a
large "c", your DNS lookups are too slow, or the receiving host
is to slow; increasing the concurrency can help as long as you
don't overload the host and network. If delays have a large "d"
then you need a faster network connection.
So what is the nature of your delivery problem?
Wietse
