The situation is not solved yet, but I want to express a big thanks to everyone who replied.
I’m waiting for a reply from my ISP about the port 25 interference. I’ve leaned a lot from your suggestions, although some are at the edge of my capabilities. Setting up a new VPS is actually what I wanted to avoid, I had that before, but moved it home. Because of the issues and potential monitoring, I might be moving back to an external VPS. Here’s some tests you might find interesting. I run a few traceroute -T to port 25 and a few other ports, like 22 and 80 on google and gmail. All the non port 25 tests, took about 15-27 hops. But the port 25 ones only took 7 or 8, and have a look at the IP at the next-to-last hop of the route. 192.168.20.20?? What? user@wopr4:/etc/postfix$ sudo traceroute -T -p 25 smtp.gmail.com traceroute to smtp.gmail.com (142.250.4.108), 30 hops max, 60 byte packets 1 192.168.0.1 (192.168.0.1) 0.961 ms 0.773 ms 0.770 ms 2 * * * 3 129.216.24.125.in-addr.arpa (125.24.216.129) 5.866 ms 5.683 ms 5.850 ms 4 * * * 5 165.217.24.125.in-addr.arpa (125.24.217.165) 9.522 ms 161.217.24.125.in-addr.arpa (125.24.217.161) 9.311 ms 165.217.24.125.in-addr.arpa (125.24.217.165) 9.015 ms 6 203.113.59.130 (203.113.59.130) 9.153 ms 7.846 ms 203.113.59.128 (203.113.59.128) 7.818 ms 7 192.168.20.20 (192.168.20.20) 9.648 ms 8.917 ms sm-in-f108.1e100.net (142.250.4.108) 6.784 ms user@wopr4:/etc/postfix$ sudo traceroute -T -p 25 reception.mail-tester.com traceroute to reception.mail-tester.com (94.23.206.89), 30 hops max, 60 byte packets 1 192.168.0.1 (192.168.0.1) 1.079 ms 0.939 ms 1.200 ms 2 * * * 3 129.216.24.125.in-addr.arpa (125.24.216.129) 7.396 ms 7.109 ms 7.033 ms 4 * * * 5 165.217.24.125.in-addr.arpa (125.24.217.165) 9.645 ms 9.548 ms 9.473 ms 6 203.113.59.128 (203.113.59.128) 13.410 ms 7.639 ms 7.460 ms 7 192.168.20.20 (192.168.20.20) 9.929 ms 89.206.23.94.in-addr.arpa (94.23.206.89) 7.406 ms 192.168.20.20 (192.168.20.20) 9.611 ms user@wopr4:/etc/postfix$ sudo traceroute -T -p 25 smtp.univie.ac.at traceroute to smtp.univie.ac.at (131.130.3.111), 30 hops max, 60 byte packets 1 192.168.0.1 (192.168.0.1) 1.084 ms 1.277 ms 1.432 ms 2 * * * 3 node-16rl.pool-125-24.dynamic.totinternet.net (125.24.216.129) 7.886 ms 7.710 ms 7.526 ms 4 * * * 5 node-16zp.pool-125-24.dynamic.totinternet.net (125.24.217.165) 10.211 ms 10.037 ms node-16zl.pool-125-24.dynamic.totinternet.net (125.24.217.161) 9.846 ms 6 203.113.59.130 (203.113.59.130) 9.668 ms 7.902 ms 203.113.59.128 (203.113.59.128) 7.783 ms 7 192.168.20.20 (192.168.20.20) 9.091 ms 8.829 ms 11.607 ms 8 justin.univie.ac.at (131.130.3.111) 10.002 ms 8.949 ms 8.725 ms I also find it very impressive that it reaches univie.ac.at in 9 ms, considering the tracetime when NOT using port 25, is 260 ms. user@wopr4:/etc/postfix$ sudo traceroute -f 30 -w 10 -m 50 -p 25 -T univie.ac.at traceroute to univie.ac.at (131.130.70.63), 50 hops max, 60 byte packets 30 63.70.130.131.in-addr.arpa (131.130.70.63) 7.177 ms 9.754 ms 9.539 ms user@wopr4:/etc/postfix$ sudo traceroute -f 30 -w 10 -m 50 -T univie.ac.at traceroute to univie.ac.at (131.130.70.63), 50 hops max, 60 byte packets 30 michaela.univie.ac.at (131.130.70.63) 263.513 ms 262.904 ms 263.705 ms Must be magic. Or maybe I’m just not understanding what I’m doing.
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