Re: Postfix: Limiting the number of messages per smtp connection

[Anders Nielsen <anielsen diku dk>]

On Fri, 2004-09-10 at 11:55, Jussi Silvennoinen wrote:
> On Fri, 10 Sep 2004, Anders Nielsen wrote:
> 
> > I am trying to deliver around 50000 personalized emails to our users
> > every night.
> > 
> > A major ISP in this country has put a limit on their mail servers so
> > they only accept 20 messages per SMTP connection. This is done to
> > prevent spam.
> > 
> > Is it possible for me to limit postfix so it only sends 20 mails per
> > SMTP connection?
> 
> Postfix doesn't work like that. It sends one message per connection. Only 
> in recent snapshots you can use connection caching which will allow you to 
> send more than one message per connection.
> 

I wasn't aware of this. Thank you for pointing it out.

> I guess you're talking about recipients, not messages. 50 recipient's per 
> message is the default. 
> 

I wasn't. The messages are personalized and only have 1 recipient each.

If I have say 10000 messages for a single mail host will postfix try to
deliver them in parallel?

I notice the smtp_destination_concurrency_limit is set to 20 as default.
Does this mean that postfix will make 20 concurrent connections the the
same host? This seems to be an extremely high value.

Thanks
  Anders