Occasionally, a channel may not be able to process a message (for example, the channel may go down, which is considered a transient failure, or a user is unknown, which is a permanent failure). For a permanent failure, the message is bounced and a notification is sent to the postmaster.
For a transient failure, by default, the channel will send up to three warning messages to the originator of the message at the following intervals: 1 day, 2 days, 4 days, and 7 days after the original message was sent. Each warning message will inform the originator that the original message is undeliverable, why the message is undeliverable, and how long delivery attempts will continue. By default, 12 days after the original message was sent, the original message will be returned to the originator. If the failure is corrected before the 12 days, the messages will be delivered. You can reconfigure the interval at which the warning messages are sent and the original message is returned.
By default, the local postmaster receives a copy of all warning messages for transient and permanent failures except those undelivered messages that do not have an originator address. You can reconfigure the channel to send a copy of all or no warning messages to the local postmaster. Although receiving a copy of each of the warning messages may help you monitor the state of the channel queue, you will have to weigh this benefit against the increase in traffic that the channel will need to handle. To configure what part of the message is sent to the postmaster, you can add additional channel keywords in imta.cnf (see the SIMS Reference Manual).
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AdminConsole>IMTA>Channels>selected channel>Selected Menu>Properties>Report Problems to Postmaster
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