Can you advise me on what you consider the best mail module is?

What email module do you use (if any), and what are the best features in your opinion?

I have tried both WebMailFX, and Tropical Mail. I highly prefer the scalability of WebmailFX, but Im not happy with the security risks in using it. I have found a few bugs too.

I think Tropical Mail would be awesome if it had automatic account creation.

I haven't tried sqMail, but if anyone else has, please give me feedback.

Thanks!