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(Mono C#) Verify Email RecipientsA way to possibly determine valid/invalid email addresses. I would recommend being very careful about doing this because your IP address may be flagged as a potential spammer by the mail server (because you are probing for valid/invalid email addresses). This Chilkat functionality existed for many years, before this kind of activity became a problem. The functionality remains only because it is useful for some to test with their own SMTP servers.
// This example requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. Chilkat.MailMan mailman = new Chilkat.MailMan(); // SMTP connection settings... mailman.SmtpHost = "smtp.example.com"; mailman.SmtpUsername = "MY_SMTP_USERNAME"; mailman.SmtpPassword = "MY_SMTP_PASSWORD"; mailman.SmtpSsl = true; mailman.SmtpPort = 465; // Create a new email object Chilkat.Email email = new Chilkat.Email(); email.Subject = "This is a test"; email.Body = "This is a test"; email.From = "myemail@example.com"; bool success = email.AddTo("person1","person1@example.com"); success = email.AddTo("person2","person2@example.com"); success = email.AddTo("person3","person3@example.com"); // The SMTP server smtp.example.com won't know anything about an email address @somewhere_else.com success = email.AddTo("person3","person4@somewhere_else.com"); // ... // Verify recipients. // **** See the warning about using this API method in the description above. // (An SMTP server only knows valid email address for its own domain. For example, // smtp.example.com *may* only know if person1@example.com is valid or invalid, but does // not know anything about the validity of email addresses having other domains.) Chilkat.StringArray badAddrs = new Chilkat.StringArray(); success = mailman.VerifyRecips(email,badAddrs); if (success != true) { Debug.WriteLine(mailman.LastErrorText); return; } int i = 0; while (i < badAddrs.Count) { Debug.WriteLine(badAddrs.GetString(i)); i = i + 1; } Debug.WriteLine("done."); |
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