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Thread: System.Net.Mail.SmtpFailedRecipientException: Mailbox unavailable.

  1. Aug 19th, 2008, 01:17 PM #1
    vbbit
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    System.Net.Mail.SmtpFailedRecipientException: Mailbox unavailable.

    I have a registration page that the users register and get an email verification. We seem to be able to do that in our network; however, if external users want to register, they never got the email. I looked at the event log and it says:

    Code:
    System.Net.Mail.SmtpFailedRecipientException: Mailbox unavailable. The server response was: 5.7.1 Unable to relay for [email protected]
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  2. Aug 22nd, 2008, 03:55 AM #2
    mendhak
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    Re: System.Net.Mail.SmtpFailedRecipientException: Mailbox unavailable.

    Do you know for a fact that [email protected] exists?
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