IMAP(s) with SSL Offloading with Client Certificate Authentication

Hi,

As you know IMAP is an application layer Internet Protocol using the underlying transport layer protocols to establish host-to-host communication services for applications. This allows the use of a remote mail server. The well-known port address for IMAP is 143.

So in fact IMAPS (IMAP over SSL) allows IMAP traffic travel over a secure socket to a secure port, typically TCP port 993.

Internet IMAP port 993 SSL <> F5 Load balancer + Cert auth <> Exchange port 143

But I think that the problem will come from App client (messaging app) that can't negociate auth using a cert.

it's like the exchange client using OutlookAnywhere. cert auth was not possible in spite of the ssl / tls...

the best way is to test but I do not believe in this type of deployment

hope it's clear. regards,