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As I keep saying this isn’t really an issue with anti-virus programs, the whole point of SSL is to stop people poking around in your email. It is encrypted so to scan it you would have to decrypt it and that either requires a key or a lot of processing power to break it and you wouldn’t want to be going through this just to check scan your email.

So it is a step in security for ISPs (that is the only one they are interested in) and for you in that your email is secure during transmission and receipt. But the consequences of that action by the ISP could be less security unless you take further steps.

As I said avast has a plug-in for MS Outlook which allows it to work inside the email program with SSL email. Effectively it would require avast to have a plug-in for every email client out there, an unreasonable option, even if you considered only the major email clients this would be a large task. With the avast email scanner operating outside the email program it will work with almost all email programs that conform to the email standards and protocols. Remember I’m just an avast user like you and have no input in what avast does.

Personally I believe you should choose the email client that suits your needs and if that requires the use of STunnel then so be it, once set-up and running you can forget it.