Am 2024-05-22 01:22, schrieb Greg Sims via Postfix-users:
TLS connection reuse is being used. About 10% of the connections are reused for large volume ISPs. Small volume ISPs do not see connection reuse. I believe this is as expected.I did some testing of our DNS setup. A DNS query using dig is less than 20 msec for both our primary and secondary dns servers in /etc/resolv.conf -- see below.
If all else fails:The truth can often be seen on the wire. Make a packet trace which covers the time from "here is the mail you have to send to google" to a successful delivery and inspect it in wireshark. For TLS traffic you need the cert/key in wireshark. Do not only trace the smtp traffic, but all traffic. Inspect what the system is doing (e.g. DNS lookups) and correlate that to the traffic you see (you can change how timestamps are displayed in wireshark). This may indicate where those 25 seconds are spend.
This is a steep learning curve if you are not familiar already with interpreting network packets, the smtp protocol, DNS, and wireshark. If those skills are already available, it may lead to detecting the cause of what you see faster than the back and forth with guesses here on the mailinglist.
Bye, Alexander. -- http://www.Leidinger.net alexan...@leidinger.net: PGP 0x8F31830F9F2772BF http://www.FreeBSD.org netch...@freebsd.org : PGP 0x8F31830F9F2772BF
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