Subject: Return email - Mailbox Unknown
Date: 2015-01-15 03:36:45
From: Silvy Sudjana
Source: return-email-mailbox-unknown


My .NET application parse return emails with result Mailbox Unknown as email sending failure, and doing resend though non email platform. But some of the email recipients mentioned that they have actually received the email, thus receiving duplicates.

What does MailboxUnknow mean? Does MailboxUnknown actually mean that the email was failed to send or otherwise?

Thank you for assisting.



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