isBizMail tells you whether a given email address is free (gmail.com, yahoo.es, yandex.ru etc) or not. The list of emails used by isBizMail is taken from here¹. Detects around 2500 domains and subdomains.

1. All credits for the list itself go to SpamAssasin authors and contributors

• JavaScript implementation (Vanilla / CommomJS module)
• PHP implementation (PHP 5.4.0+)

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You can install IsBizMail for .NET Core 2.0+ / Framework 4.6.1+, Mono 5.4+ etc via NuGet.

You could build it from sources via:

dotnet build

IsBizMail in .NET is a static class, so can use it like this:

using Salaros.Email;

//..
{
    Console.WriteLine(IsBizMail.IsValid("foo@bar.com"));        // true
    Console.WriteLine(IsBizMail.IsValid("hello@gmail.com"));    // false
}
//..

dotnet test tests