Proxy between pop3s and pop3-only speaking blob?

[Jon]

Here at work we're using an old version of Gordano Messaging Suite which 
only supports POP3, running on Redhat. The only way to get POP3s (if we 
can) is to upgrade to a newer version but we want to migrate to OpenBSD 
eventually. What tool(s) (that will work best with OpenBSD when we move 
over) would be ideal to run on the same machine to translate pop3 and 
pop3s or fetch the mail from Gordano then offer it via pop3s?