Context.IO vs MailKit: What are the differences?

Context.IO: A REST email API that makes it easy and fast to integrate your user's email data in your application. As soon as a mailbox is connected, we create a metadata index of its content starting from the most recent emails which become available from the API within seconds. Context.IO takes care of synching email data for your app so you don't have to build, scale and maintain this infrastructure yourself. Focus on what's unique to your business, we'll manage the technical details of integrating with arcane email server protocols; MailKit: A cross-platform .NET library for IMAP, POP3, and SMTP. It is a cross-platform mail client library built on top of MimeKit. The main goal of this project is to provide the .NET world with robust, fully featured and RFC-compliant SMTP, POP3, and IMAP client implementations.

Context.IO and MailKit can be categorized as "Email API" tools.

Some of the features offered by Context.IO are:

• REST Beats IMAP
• Contacts- Recipients and senders with stats like message count and latest sent/received.
• Files- Each attachment has a unique id to access its content and history.

On the other hand, MailKit provides the following key features:

• SASL Authentication
• Supports S/MIME v3.2
• Supports OpenPGP

MailKit is an open source tool with 2.84K GitHub stars and 461 GitHub forks. Here's a link to MailKit's open source repository on GitHub.