On Thu, Apr 28, 2011 at 07:02:06PM -0400, Homer Wilson Smith wrote:
> Apparently cached smtp connections on the sending server (to the
> popper) are brought down early if there is nothing to send.
>
> Also apparently there is a minimum of 5 connections, had
> smtp_destination_concurrency_limit set to 1 just for yuks, and still got 5
> or 6 established according to netstat.
The destination concurrency limit is per destination nexthop, not per
destination MX host. If a bunch of domains under your control have the
same MX hosts, you can add a transport entry to tell the queue manager
that this is the case:
example.com relay:example.com
example.org relay:example.com
example.net relay:example.com
example.edu relay:example.com
...
with the above, the MX records for example.com will be used for all
the domains, and concurrency, caching, ... will all be for the single
example.com nexthop.
--
Viktor.
