Use this SDK for implementing SendGrid email platform with C#. Note that use of the SDK requires .NET 4.5 and above. See the documentation for instructions on retrieving and installing the libraries, as well as information on functions like: sending a email, adding an attachment, and using filters.
For any business or website that relies on user or customer interaction, communication is important, and often the only point of contact a business may have with that customer is an email address. This is where email validation can lend a helping hand; as long as mail can be successfully sent to an address all is good, but if there's some issue causing failed delivery and other errors, better to know about it. Email Pie is a free, JSON API that provides a simple way to validate email addresses.
CallME's RESTful click-to-call API allows you to integrate Click-to-Call into your website as connect any phone number to another number easily. The service provides calling from a browser, voice messaging and a few other telephony features.