Hi shawniverson,
So I have been able to narrow it down to the it being something on the host that has started to cause this issue.
if I try to telnet to any external server on port 25 from the efa server the connection times out:
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telnet smtp.office365.com 25
Trying 52.96.88.226...
telnet: connect to address 52.96.88.226: Connection timed out
Trying 52.96.88.210...
telnet: connect to address 52.96.88.210: Connection timed out
Trying 52.96.191.146...
A ping is successful:
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ping smtp.office365.com
PING yyz-efz.ms-acdc.office.com (52.96.191.146) 56(84) bytes of data.
64 bytes from 52.96.191.146 (52.96.191.146): icmp_seq=1 ttl=241 time=22.8 ms
64 bytes from 52.96.191.146 (52.96.191.146): icmp_seq=2 ttl=241 time=21.2 ms
So i know it can reach it
if i try using port 587, then that is successful:
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telnet smtp.office365.com 587
Trying 52.96.215.50...
Connected to smtp.office365.com.
Escape character is '^]'.
220 YT3PR01CA0098.outlook.office365.com Microsoft ESMTP MAIL Service ready at Wed, 27 Apr 2022 13:46:00 +0000
But I try from another server on teh same network and the same telnet connection works:
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telnet smtp.office365.com 25
Trying 2603:1036:30a:1423::2...
Connected to smtp.office365.com.
Escape character is '^]'.
220 YT3PR01CA0145.outlook.office365.com Microsoft ESMTP MAIL Service ready at Wed, 27 Apr 2022 13:20:09 +0000
quit
221 2.0.0 Service closing transmission channel
Based on this I know that my ISP is not blocking port 25, I just can't seem to be able to figure out what on the OS is causing port 25 to be blocked for outgoing messages, incomming messages are arriving without issue.