How to understand whether email is sent to not existing address

Question

Hi I am Ivaylo I am using rebex mail to send e-mail but I need to understand whether the e-mail was sent to a non-existing address and was not delivered or it was delivered successfully. Thanks in addvance.

Answer 1

When an e-mail is sent to non-existing address, the last SMTP server that accepted the message for delivery (which is your SMTP server in most cases) should generate a non-delivery report (or delivery status notification) and mail it to the the sender's e-mail address.

These reports can be downloaded and parsed using Rebex Secure Mail's POP3 or IMAP and MailMessage object and a DSN parser found in another forum post. Some SMTP servers also make it possible to request a notification when the message has been delivered successfully (this is also explained in the forum post).