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IMAP4 clients with a mailbox size limit do not receive messages and the sender of the message receives the following non-delivery report (NDR):
The intended recipient's mailbox is full.
The NDR is sent even though the actual mailbox size for the recipient is below the size limit.
The total mailbox size is the sum of the TotalMboxSize and TotalOtherSize values. The mail server does not reduce the TotalOtherSize value when clients delete and purge messages in folders other than the inbox. Because the TotalOtherSize value never decreases, the total mailbox size will continue to increase in size and when it reaches its size limit, the client will no longer be able to receive mail.
To resolve this problem, obtain the latest service pack for Windows NT 4.0 or the individual software update. For information on obtaining the latest service pack, please go to:
152734 how to obtain the latest windows nt 4.0 service pack
For information on obtaining the individual software update, contact Microsoft Product Support Services. For a complete list of Microsoft Product Support Services phone numbers and information on support costs, please go to the following address on the World Wide Web: