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Why did I get a mail delivery failure notice?

There are several possible caused for mail delivery failures, such as problems with your or the
recipient's email account (i.e. account specific) or the sending or receiving domain (i.e. domain
specific). In most cases the error transcript will show if the problem is account specific or domain
specific. The list below has some common errors contained in the transcript and will help you
understand why you got a mail delivery notice.

Account Specific errors:
  • User unknown/invalid user/Mailbox unavailable:
  • These indicate that the recipient' s
    account does not exist. If you see this, check to make sure you' ve typed the correct
    email address in the To; box. If so, contact the recipient some other way to verify their
    email address and try sending the mail again.
  • Account Inactive:
  • This indicates that the recipient' s account is currently inactive. If the
    recipient is a BlueLight Internet member they should log in to the BlueLight Internet software to reactivate
    their account. If the recipient is not a BlueLight Internet member, they should contact the technical
    support of their email service provider to find out how to reactivate the account.
  • Message exceeds the size limit:
  • This indicates that you tried to send a message that
    was larger than the acceptable size limit set by the recipient' s email provider. If possible,
    try breaking up the message into smaller parts and re-send them.
  • Service unavailable:
  • This error message can have multiple meanings. If you see this in
    the transcript, forward the message with the transcript and full headers to BlueLight Internet
    email support for further investigation.
  • Mail Quota Exceeded/Mailbox Disk Quota Exceeded:
  • This message indicates that the
    recipient's mailbox is full, and cannot accept any more emails. To resolve this, contact
    the recipient and ask them to clear their mailbox.
Domain Specific:
  • Host unknown:
  • This message indicates that the domain to which the mail was sent
    does not exist. Contact the recipient and verify their correct email address (including the
    domain name) and try sending the mail again.
  • Deferred: Connection timed out with Message could not be
    delivered for 3 days:
  • This message indicates that the failure occurred because of a
    temporary problem. Try sending this message again at a later time. If the problem
    persists after trying again, have the recipient contact thier domain administrators.
  • Domain block:
  • This message means the recipient' s domain has placed a block on your
    email address or on all mail coming from BlueLight Internet
    1. The recipient domain is BlueLight Internet:
    2. If you are sending email to a BlueLight Internet email address,
      and it blocks the message, you' ll receive an Access denied error transcript.

      A sample of the Access denied error transcript is shown below for your reference:
      550 Access denied...2ab079a1b0b0ddddc9a0c979793dd9d901e0e0e9e50489118d

      To resolve this issue, forward the entire mail delivery failure notice (including the complete
      Access Denied error transcript) to abuse@support.BlueLight along with a detailed
      description of the problem or situation.

      Please note: The complete Access denied code includes a string of random
      alphanumeric characters having three dots ("...") as the prefix as well as the suffix.

    3. The recipient is at another domain (i.e.,,, etc.):
    4. If
      the recipient domain is blocking the message, you' ll probably see one of the following
      error messages:

      a.  This domain is banned
      b.  This domain is banned for spamming
      c.  Message from domain BlueLight is rejected
      d.  Unsolicited email is refused

      To resolve this issue, contact the recipient inform them of this situation, and them
      contact their domain and let them know they wish to receive mail from BlueLight Internet.

      BlueLight Internet does contact the recipient's domain, however, domains often respond
      most quickly to reports from their own users.