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 no longer having that issue, and based on Viktor's response, we're still well under postfix's default timeouts for both values.
On Mon, Oct 17, 2011 at 11:42 PM, Ralf Hildebrandt < ralf.hildebra...@charite.de> wrote: > * Edward Morbius <dredmorb...@gmail.com>: > > 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 in bumping these > > values up? 20s for connection, 40s for HELO is where we're at presently. > > Which values exactly? > > -- > Ralf Hildebrandt > Geschäftsbereich IT | Abteilung Netzwerk > Charité - Universitätsmedizin Berlin > Campus Benjamin Franklin > Hindenburgdamm 30 | D-12203 Berlin > Tel. +49 30 450 570 155 | Fax: +49 30 450 570 962 > ralf.hildebra...@charite.de | http://www.charite.de > > -- Dr. Ed Morbius Chief Scientist / Philologist / Robot Wrangler / Powerplant Operator Krell Power Systems Unlimited
