I have an old computer which I'd very much like to be able to use with my modern Gmail and iCloud email accounts. The old computer can do IMAP, POP and SMTP - but it can't do SSL (hence the need for an intermediary). I can hear the objections already - if you have a new computer, why would you want to use your old one? I'm afraid to say that the answer is 'I just do!'
One of my newer computers, the one that's on all the time, is a Raspberry Pi running Raspbian (a Debian Linux fork). So my question is, is there any software available which can be set up easily and which will act as a mail server for my old computer? It should handle the secure sign in to my email accounts, and then serve that email (Preferably IMAP, but POP is okay too) so that my old computer can retrieve it.
Conversely, when email is sent from my old computer the software should then forward it on to iCloud or Gmail (or whatever).
I've tried using stunnel, but I can't get it to work for me.
Any suggestions will be eagerly received - and I'm sure that I'm not the only person who'd be interested!