Hello - I tried searching, but could not find a similar issue.
We are running:
and are having a problem with POP3:
Release 5.0.18_GA_3011.UBUNTU8 UBUNTU8 FOSS edition
When we moved from LAB to production, everything worked just fine. When we changed the hostname from mail.example.com to our proper server name (following the instructions here ZmSetServerName - Zimbra :: Wiki) and since then, no POP3 clients can connect over port 110. We've tried telnetting on port 110 from an off-site location, to no avail. When we telnet from the server itself, we get:
everywhere else it's:
zimbra@zimbra:/$ telnet mail.ourserver.com 110
Connected to localhost.
Escape character is '^]'.
+OK mail.ourserver.com Zimbra POP3 server ready
Externally, we can connect via SSL over POP3 with no problems (aside from certificate mismatch errors, which we know that we just need to re-create / purchase a cert).
C:\>telnet mail.ourserver.com 110
Connecting To mail.ourserver.com...Could not open connection to the host, on
port 110: Connect failed
Again, this only started happening after changing the server name. Any assistance would be greatly appreciated. If you need any additional info - please let me know!