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

Answer: 
I've used IP\*Works SMTP component before. I didn't do anything involved with them, I used them to send an email with error information basically. I have never used the SSL version either.

I don't believe you can purchase the components individually either.

<http://nsoftware.com/ipworks/components.aspx>
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).