Top 20 NuGet smtp Packages

Library written in F# to receive emails. Can be used from C# or F# in end-to-end tests to ensure emails are being sent correctly.
Simple email wrapper in C# for SMTP and Mailgun
Mailzory helps you to send emails which are based on Razor templates. Mailzory is dependent on RazorEngine project.
Umbraco Package: Supports a mail cache and SSL / SMIME for .NET SmtpClient. For SMIME the package uses a derivation of Cpi.Net.SecureMail by Pete Everett (https://www.codeproject.com/Articles/41727/An-S-MIME-Library-for-Sending-Signed-and-Encrypted).
Mail sending utilities for .NET
A simple but effective SMTP client for ASP.NET core
An implementation of SMTP (Simple Mail Transfer Protocol) conversation to build SMTP service.
This is a c# 4.5.2 utility dll for sending emails using Exchange, SMTP or Mailgun
A library to simplify creating and sending emails with built in support for audiences and templating.
SMTP Client for sending emails
SMTP Client for sending emails using Mailkit and Mimekit
Simply facade library over System.Net.Mail API.
Scriban based template renderer for PostOffice, a simply facade library over System.Net.Mail API.
NetSPF is a simple SPF validation utility.
Package Description
The SMTP Provider for TakNotify library