Mail.dll 2.5

.NET component for sending and receiving email messages.
Includes POP3 and SMTP clients with SSL support.
Written entirely in managed code in C#.

Component features:
automatic email parsing when fetched from POP3 server, including:
From, Sender, Reply-to, To, Cc fields,
Subject field,
Date field,
access to every custom header of every mime entity,
attachment encoding/decoding,
automatic charset recognition,
secure login (APOP command support),
getting header information only (TOP command support).
With examples in C# and VB.NET, with InteliSense support.

MailMessage class representing real email structure.
SimpleMailMessage class providing simple and easy access to email message.

It's free for noncommercial use.