Why do I see lots of "valid received date not found" entries in my IMAP logs?

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Question

Looking in my IMAP log I see lots of failure entries referring to the fact that no valid received date could be found in a message.

IMAP 4 Jul 2002 18:43:39.671 F 6462 63 valid received date not found
IMAP 4 Jul 2002 18:43:39.718 F 6462 63 valid received date not found
IMAP 4 Jul 2002 18:43:39.734 F 6462 63 valid received date not found

What is the reason for this?

Answer

This is caused by copying messages from a local message store onto the server using an IMAP mail client. When storing messages locally IMAP clients do not insert a Received header containing a date and time. The IMAP service attempts to read this header to ascertain the time and date that the messages were received on the server.

If no Received header is found the IMAP service will go on to read the Date: header of the message, although this does not necessarily reflect the time that the messages arrived on the server.

The fact that there is no Received header in the message to obtain the date and time from is logged in the IMAP log. The user is not made aware of this issue and it causes no problems with message processing. It is simply logged to make the system administrator aware of the issue.

Keywords:IMAP valid recveived date not found

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