devel anaconda:
> Hello everybody!
>
> I have a little problem with local delivery performance. Due to
> specific mail routes (it's complicated), on a couples of my SMTP
> gateways, I have to deliver all local mail to another smtp:host:25.
> I do the following:
>
> myhostname = external.mydomain.com
> mydomain = mydomain.com
> mailbox_transport = smtp:internal.mydomain.com:25
> default_process_limit = 1000
>
>
> When "internal.mydomain.com" unreachable, I have queue about
> 200.000 queued mails on my "external.mydomain.com".
> And when internal.mydomain.com comes back, my external.mydomain.com
> delivers mails to it very, very slow. About 50-60 mails per second.
> I though, that it is postfix's weakness, but when I do the following:
>
> mydomain = fakedomain.com
> relayhost = [internal.mydomain.com] and restart postfix, all queue flushes to
> internal.mydomain.com 20 times faster (about 1000 mails per second), than if
> it mailbox_transport = smtp:internal.mydomain.com:25.
>
> My question is - how can I get _MAXIMUM_ performance of local
> delivery by smtp/lmtp. As fast, as forwarding by "relayhost"? Due
> to specific of my mail-routing, I can't use "relayhost" scheme.
To maximize the delivery rate, don't use mailbox_transport, which
forces Postfix to delivery mail via the local delivery agent first.
The local delivery agent has a safety mechanism that gives each
recipient only a low concurrency level.
Wietse
