Display the mail queue with this command:

If there are any pending e-mail messages, this command shows the e-mail addresses of their senders and recipients, and the reasons that the messages were retained in the queue. If the entire reason is not be shown by this command, the complete message can be obtained by reprocessing the messages in the queue.

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Using root to run the command:

will process the mail queue and put a log of the mail session in a file.

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Some possible reasons that messages might not be sent successfully are:

451 Message held for human verification before permitting delivery.

The message was not delivered immediately, but placed in a queue where it can be examined by a person, probably to ensure that it is not spam. If not spam, the message will probably be delivered at a later time.

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