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Thread: 451 error.

  1. #1
    Join Date
    May 2001
    Iasi, Romania.

    451 error.

    When trying to send an email message from a server to another server I receive the following message:

    SMTP error from remote mailer after MAIL FROM: SIZE=2412: host [209.51.***.***]: 451 rejected: temporarily unable to verify sender address (try again later).

    Could you tell me what's the cause of this error ?

    Thank you.

  2. #2
    Join Date
    Sep 2001
    This could be if your sending domain's DNS is down.

    The remote SMTP is trying to verify the sender's DNS and if it returns a time-out or lameserver this message can occur
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