The following is the basics of the code that will verify that the domain actually exists: There is a lot more you can do, actually trying to connect for example, to verify that the domain will receive the mail. :[\x01-\x08\x0b\x0c\x0e-\x1f\x21-\x5a\x53-\x7f]|\[\x01-\x09\x0b\x0c\x0e-\x7f]) )\]) I've updated this with a simpler expression (including case insensitivity) in order to hopefully make it a bit clearer.Normally you shouldn't use try/catch for validation, but it works well here.
Collaborative validation therefore embraces the accreditation of institutions, the franchising of courses and other forms of academic association.
Yeah, split the emails string on the delimiter and then validate each email address.
So our focus is to ensure that the Mail Message does not throw an exception during a send. But outside of that, if you give bad email address, you don't get an email.
The Tools page has information on specific test tools known to be available.
If you run your own DNS server, you can use the exists: mechanism to capture information on where mail from your domain is being sent from.