Author: Adam Nielsen Date: To: exim-users Subject: Re: [exim] How do you get multiple messages sent via the same
smarthost SMTP connection?
>> The problem is that this other mailserver (beyond my control) has a rate >> limit enforced. This means that after 20 connections in a row further
>> connections are dropped until traffic stops for a few minutes.
>
> You haven't set connection_max_messages = 1 ?
Nope, I've tried setting it to 200 messages as well but with no difference.
> Look at remote_max_parallel and queue_run_max.
>
> What's probably happening is that Exim is receiving the mail and
> immediately trying to send it on. If you can tolerate a short delay in
> sending email, you might try configuring Exim to queue all mail instead
> of delivering immediately and running with more frequent queue-runners.
That's what I thought, but after the first run through there are about
1000 messages stuck in the queue (because they couldn't contact the
server.) Every time I start a queue runner another 20 messages go but
the rest are stuck, so I assume pre-queueing all the messages wouldn't
make any difference?
> Basically, you're arranging for Exim to figure out where all the mail
> has to go, but only actually sending it out periodically, when there's
> likely to be multiple items that can be delivered down a connection.
Are "figuring out where the mail has to go" and "sending it out"
actually two different steps? Because like I say the mail is being
queued, and flushing the queue still only sends one message per SMTP
connection - but if it's not "figuring out where the mail has to go"
until the last minute perhaps this could still explain why it's only
sending one message per connection.
