Aegis Implicit Mail is a free and open source library which is designed to provide fast and developer friendly API to send emails using SMTP ports.
Binaries are available in the form of NuGet package:
https://www.nuget.org/packages/AIM
Please check http://pki.tools/aim.html as well
AIM Supports :
* None Ssl Mails
* Implicit Ssl Mails
* Explicit Ssl Mails
* Smtp Connection test
* Detect Ssl type of mail server
* Attachments for MIME and S/MIME message.
* In-line attachment...