Ralf: thanks for your response.
Our DNS queries seem fine. I tested via telnet connections to the remote
sites and confirmed that they were responding slowly to HELO. Even after
doing this (e.g.: cached DNS results) postfix was timing out with the old
values. At 20/40 for connect/helo, we were
Good to know.
I think we've addressed the problem, but it's nice to know we've got a lot
of headroom to move up. Total traffic is ~40k messages/day, and our big
sticking point's been Yahoo though we've been talking with them and may be
doing better (hopefully lots better).
The slow connections a
On Mon, Oct 17, 2011 at 07:17:18PM -0700, Edward Morbius wrote:
> Several of our peer mail systems (outbound) seem to take a while responding
> to initial SMTP connections.
>
> Is there any particularly dread pitfall to watch out for in bumping these
> values up? 20s for connection, 40s for HELO
* Edward Morbius :
> Several of our peer mail systems (outbound) seem to take a while responding
> to initial SMTP connections.
That happens if:
* your dns is slow (reverse lookups of the client IP)
* all your SMTPD processes are in use
> Is there any particularly dread pitfall to watch out for
