Mognet Sengrid is a .NET Standard 2.0 NuGet used to send mails via Sengrid. With this package you'll be able to send mails from any sort of project type ranging from .NET Framwork or Core to Xamarin and UWP.
Simple way to send emails using sendgrid using http or smtp api.
easysendgrid sg = new easysendgrid("apiuser", "apikey", "method");
string response = sg.sendmail("toaddress", "subject", "body", "from");
//method :-http or smtp
Unified Email API for Xamarin.Android by CloudRail provides an easy solution to send email with attachments.
This interface includes Gmail, Mailjet, SendGrid.
Get a free license key at: https://cloudrail.com