All in one email sender for .NET. Supports popular senders (SendGrid, MailGun, etc) and Razor templates.
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A cross-platform .NET library for IMAP, POP3, and SMTP.
Papercut SMTP -- The Simple Desktop Email Server
A .NET MIME creation and parser library with support for S/MIME, PGP, DKIM, TNEF and Unix mbox spools.
A SMTP Server component written in C#