Convention seems to follow Outlook Express for many US ISPs. Haven’t used AOL. POP3 mail is SSL on port 995, SMTP is TLS on port 25, which OE call SSL. If you use Thunderbird, you need to indicate TLS not SSL for SMTP to work . SMTP works for my ISP with either 25 or 587 as the port in stunnel.conf. Now using

We’re running as a client to SSLify the POP/SMTP connections

client=yes

POP3 service, listens on localhost:11110

[xxxx-pop3s]
accept=localhost:11110
connect:995=mail.xxxx.com

SMTP service, listens on localhost:11025

[xxxx-smtps]
protocol=smtp
accept=localhost:11025
connect:25=smtp.xxxx.com

With 11110 and 11025 the ports in Thunderbird (servers 127.0.0.1) and the redirect ports in Avast! Never need to go to Avast.ini in 4.6.