Rebex SMTP

SMTP, MIME, S/MIME libraries for .NET

More .NET libraries

Rebex Mail Pack
IMAP, MS Graph, EWS, POP3, SMTP, MIME, S/MIME, MSG
Rebex Total Pack
All Rebex .NET libraries together

// send mail with a single line of code
Rebex.Net.Smtp.Send("from@example.org", "to@example.org", 
   "Subject", "Body", 
   "smtp.example.org");

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.NET library for sending e-mails using SMTP servers. Quickly send an e-mail with a single line of code. Or send complex e-mails with multiple recipients, attachments and special features. Supports TLS 1.3/1.2 and S/MIME.

Why Rebex SMTP?

Up-to-date TLS support

Features TLS 1.2 and 1.3 on all mainstream platforms (Windows 7 and higher). Supports modern TLS ciphers such as AES/GCM, ChaCha20/Poly1305, ECDSA and more.

MIME and S/MIME API

API for MIME and S/MIME messages is included. Supports signing and signature validation. Based on X.509 certificates and Cryptographic Message Syntax (PKCS #7).