how to check if a given email address actually exist in c#?

Question

I am building a C# application where users creat an account and type their email address, I know how to validate it with Regular expression, what I am having truble with is how to check if that email actually exist? i.e. [email protected] --> is there such email address?

Thanks!

Answer 1

The only way to check this is to send an email to that address and make sure that you send a link that needs to be clicked to activate the account. There is no other way to check if an email is correct

Answer 2

Have a look at EmailVerify.NET

EmailVerify.NET is a powerful Microsoft .NET software component that verifies e-mail addresses with various tools, including:

• Advanced syntax verification, according to IETF standards (RFC 2821 and RFC 2822, among others)
  • DNS validations, including MX record(s) lookup
  • Disposable e-mail address (DEA) validation
  • SMTP connection and availability checking
  • Mailbox existence checking, with greylisting and temporary unavailability support
  • Catch-all testing