Question: Indy is not enough for me, it must support SSL and be rock solid, can be commercial also

Answer: 
Icsn (and Ics-ssl) components at :
<http://www.overbyte.be/frame_index.html>
I use [Synapse](http://synapse.ararat.cz/doku.php) library. It works very well with SSL/TLS. There is public wiki with information on "[How To Use SMTP with TLS](http://synapse.ararat.cz/doku.php/public:howto:smtpsend)". It works with Delphi (I use Turbo that is based on 2006) and FPC. It is "normal" library, not component and in my opinion this is advantage for command line utilities or server applications.