Why did I receive email about a suspect attachment or an undeliverable message?

To protect computers at Indiana University, UITS has enabled filters for attachments that have been known to carry viruses; see At IU, what types of attachments are blocked from my email account? If you receive a message from "Mail Delivery System <MAILER-DAEMON@indiana.edu>", you may have attempted to send one of the prohibited attachment types. This can happen whether you are sending to or from an IU email account; as long as the message passes through the IU mail relays, it will be blocked.

Because email systems can vary in how they handle these messages, you may not receive an explanation in the message itself. Look for one or more of the following:

  • A subject line of "Delivery Status Notification (Failure)".
  • "Undeliverable:" or "[Suspect attachment]" in the subject line. Note that this may not be present in the subject line as you receive it, but may be in the original subject line, now in the body of the message.
  • A message body that reads:

    The following message to <username@indiana.edu> was undeliverable.

    The reason for the problem:

    5.x.0 - Message bounced by administrator

  • A message body that reads:

    Suspect attachment [filename] was removed. See http://kb.iu.edu/d/bdaw for more information.

Any of these can indicate that your message did not reach the recipient.

For help, contact your campus Support Center.

This is document bdaw in the Knowledge Base.
Last modified on 2016-11-21 14:54:06.

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