EmailVerify.NET

With the term catch-all, we mean a mailbox on a domain that will receive all of the email messages addressed to that domain, even if their addresses do not exist in the mail server. EmailVerify.NET detects catch-all domains automatically and gives back a specific status code that signal the presence of such a domain; while catch-all domains actually accept every possible local part, you will usually don't want to consider addresses that pertain to them as a failure but, rather, you may possibly want to flag them in your database. Under the CatchAll validation level, however, the presence of these addresses yields to a specific kind of failure, as shown in the code below.

            var verifier = new EmailVerifier();

            // ...

            var result = verifier.Verify("bob@example.com",
                VerificationLevel.CatchAll);

            if (result.IsSuccess)
            {
                // The mailbox exists and the server is not a catch-all
            }
            else
            {
                switch (result.Status)
                {
                    case VerificationStatus.ServerIsCatchAll:
                        // The server acts as a catch-all for the requested domain
                        break;

                    case VerificationStatus.CatchAllConnectionFailure:
                        // A network failure happened while performing the catch-all
                        // test
                        break;
                    
                    case VerificationStatus.CatchAllValidationTimeout:
                        // A timeout occured while performing the catch-all test on
                        // the server; we need to increase the related settings value
                        break;

                    // TODO: Add more cases, if needed

                    default:
                        // ...
                        break;
                }
            }