Squirrelmail shouldn't do ssl. Squirrelmail will connect to uw-imapd via the localhost, so you can install uw-imapd (and block imap port for remote connections). When you config squirrelmail with the perl script, config it to use https, then the connection/authentication to squirrelmail is ssl protected. Also, you don't need to tls nor any special config to exim/postfix/etc since again squirrelmail connects via localhost to send email. Exim's default config will relay localhost. its a really great solution as squirrelmail is very very convient since the only client you need is a browser.
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