How to Remove Messages from the MTA Queue
(Doc ID 1001803.1)
Last updated on FEBRUARY 03, 2019
Oracle Communications Messaging Server - Version 5.2.0 and later All Platforms
Checked for relevance on 23-JUN-2017.
A Message Transfer Agent (MTA) bounces a message back to the sender when the MTA cannot deliver the message to the recipient because of a permanent failure -- or a temporary failure that is not corrected within a specified amount of time. The bounced message is addressed to the sender of the original message. The From: address of the bounced message cannot contain the recipient's address because the recipient's address cannot be reached. Therefore, according to RFC 821, the bounced message contains a From: address of "<>" (that is, a null address), which signifies that an MTA, rather than the recipient, sent back the message.
Normally, because these messages are bounced back immediately, they do not appear in the queue. However, in mail-bombs and spamming, the sender's address of the original message is rarely valid, so the bounce messages can end up in the MTA queue being retried for some time.
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