Mar 27, 2026 - For details about updated CVE-2025-53521 (BIG-IP APM vulnerability), refer to K000156741.

Forum Discussion

Dmetcalfe_13626's avatar
Dmetcalfe_13626
Icon for Nimbostratus rankNimbostratus
Nov 27, 2013

How to create a VS to load balance POP3 and IMAP

I have 2 5000 series loadbalancers with LTM. Is there a simple way to load balance POP3 and IMAP mail servers. Our customer facing mail does SMTP (which I have working), POP3 and IMAP. I can't figure...
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IheartF5_45022's avatar
IheartF5_45022
Icon for Nacreous rankNacreous
Nov 28, 2013

Maybe you need SNAT (depending on your network topology).

 

IheartF5_45022's avatar
IheartF5_45022
Icon for Nacreous rankNacreous
Nov 28, 2013
Let me elaborate - you statement "If I telnet directly to the virtual server from the F5 on port 110 I can send and receive mail manually, but for some reason when I put the virtual server address into a client with port 110 I cannot retrieve mail??? " smells like a SNAT issue. Try configuring SNAT Automap on your virtual and see if that fixes the issue.