How to send mail in Asp.Net Core 3.1?

Question

ASP.NET

If a true cross-platform solution is being developed, what should be used as an smtp sender?

Answer 1

There is such an option: How to send emails in ASP.NET Core
www.mimekit.net
The description on the link says:

Run Anywhere
MimeKit and MailKit support Windows, Linux, Mac, iOS, Android, Windows Phone and more!

Answer 2

A couple more minutes of googling yields FluentEmail .
Also, if you need mail for mass mailings, you can refuse smtp and use all sorts of services, like mailchimp.
I don't see the need to wait a hundred years for a few more exotic alternatives.