S22.Imap is an easy-to-use and well-documented .NET library component for communicating with and receiving electronic mail from an Internet Message Access Protocol (IMAP) servers. It supports IMAP IDLE notifications and IMAP over SSL, allows selective fetching of parts of mail messages, is inherently thread-safe, and is well documented with lots of example code.
Aspose.Network is a suite of .NET components for network programming with support for the .NET logging framework and Microsoft Exchange Server. It can read and write Outlook Message files and provides an iCalendar engine and SSL support for the SMTP, POP3, and IMAP protocols, with mail merging features. It can import and export email messages in the MHT and EML formats. It supports all the features of SMTP, MIME, S/MIME, POP3, FTP, WhoIs, DNS, ICMP, IMAP, HTTP, SOCKS 4/4A, and SOCKS 5 components.