Am 03.05.26 um 18:40 schrieb David Prall via mailop:
I run a mailing list and have a user @f41a1.com that informed me that he isn't receiving list mail. Looking at both of
my mail servers for dcptech.com I have a number of emails backed up to him. Both ironport.dcptech.com 199.212.124.13
and ironport-c300vb.dcptech.com 199.212.124.14 can't reach mail.f41a1.com 65.108.229.46 on TCP/25. Can ping the
server, but traceroute, traceroute tcp 25, and telnet 25 all fail. Traceroute is dropped at
ex9k1.dc1.hel1.hetzner.com (213.133.119.3) 125.332 ms 125.218 ms
125.419 ms
I've tried testing from my 2 mail servers and 2 other systems within
199.212.124.0/24 with the same results.
Don't see my servers on any blocklists via mxtoolbox.com, multirbl.valli.org
and dnsbl.info.
David
From my (german) IP addresses I can reach port 25, and it answers with "220 titan.fastssdservers.com InterWorx-CP SMTP
Server ESMTP" after a loooong delay (about 20 seconds). Looks like the folks operating this mail server are somewhat
paranoid and want to prevent mail from reaching them if at all possible.
Tell that user the problem is at their end, and they need to talk to their mail provider and open the firewall for your
IP addresses.
Cheers,
Hans-Martin
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