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>
SMTP is so trivial protocol (unless you use SASL or other exotic authentication methods) that any component would work. Of course, I would recommend our [SecureBlackbox](http://www.eldos.com/sbb/) product. Freeware libraries such as Indy, ICS, Synapse to get SSL have bindings to OpenSSL DLL and also to SecureBlackbox (none of the listed has own SSL implementation).