NAME

       cancelmsg - Cancel an E-mail message

SYNOPSIS

       cancelmsg {msgid} ["reason"]

DESCRIPTION

       cancelmsg removes a message from the mail queue. There will be no more attempts to deliver
       this message, and a standard delivery failure notice is sent to the return address listed
       on the message. You can only cancel your own messages. The superuser can cancel any
       message. An attempt to cancel a message will fail if the message has already been sent (of
       course), or if a delivery attempt is currently in progress. Because a delivery attempt is
       usually started as soon as an E-mail message is added to the mail queue, a cancellation
       attempt is only effective if the message cannot be immediately delivered for some reason,
       or if the system is very busy and is working on a mail backlog.  cancelmsg works by
       marking all pending recipients as undeliverable. A non-delivery report is then generated
       and sent in the normal fashion.

       msgid is the message queue id that can be obtained from the mailq(1)[1], command. A reason
       is optional. The message does not disappear into a black void. The message will be
       returned as undeliverable, citing reason. A generic error message will be used if reason
       is not specified.

BUGS

       A non-delivery report may not be sent immediately, but delayed until the message's turn
       comes up in the scheduling queue.

       There is no immediate indication if the message cancellation worked. A subsequent
       non-delivery report is the only indication of a successful cancel. If it doesn't come, it
       means the message wasn't cancelled in time.

       A non-delivery report will not be sent for recipients whose delivery status notification
       does not include the FAIL notice.

SEE ALSO

       mailq(1)[1], courier(8)[2].

AUTHOR

       Sam Varshavchik
           Author

NOTES

        1.

           mailq(1)
           http://www.courier-mta.org/mailq.html

        2.

           courier(8)
           http://www.courier-mta.org/courier.html