XFOR: Err Msg: Unable to Deliver User Mail... Full Mailbag

• Microsoft Exchange Server, version 4.0

SYMPTOMS

When sending mail from Microsoft Exchange Server version 4.0, to a Microsoft Mail for PC Networks user through the Microsoft Mail Connector, an error message similar to the following is generated in the Microsoft Windows NT System Log (as shown in the Event Viewer).

   A mail delivery problem has been detected on 35NET/35PO1.

   MESSAGE DATA:
   SOURCE MESSAGE ID: \\MailSrv\mailpo\35po1\MAI\MA8\000252B8.MAI
   FROM: 35NET/35PO2/Admin
   DATE: 08/14/95
   TIME: 17:36
   SUBJECT: Test Message
   [017] Unable to deliver user mail due to a full mailbag.
   Message was not delivered to Administrator (35NET/35PO1/Admin)

MORE INFORMATION

The error message is generated when the Microsoft Mail Connector cannot write the message record into the mailbag (.KEY and .MBG files) of the Microsoft Mail recipient.

Microsoft Mail mailbags (.KEY and .MBG files) have a built-in limit of 4096 messages. In other words, if a mailbag contains 4096 read and unread messages, no more messages can be added to that mailbag until one or more messages are deleted from the mailbag.

When the Microsoft Mail Connector tries to deliver mail to a mailbag that already contains 4096 read and unread messages, it generates the above error message in the Event log.

RESOLUTION

If you are using Microsoft Mail client for Windows, logon to the mailbox in question and download the messages into the your .MMF file. This copies all the messages from the mailbag on the postoffice into your mail message file (.MMF) and deletes the messages in the mailbag. Make sure that the option for inbox synchronization is turned off.

If you are using the Microsoft Mail DOS client, logon to the mailbox and either move the messages into a private or public folder, or delete them from the inbox.

If you are using the Microsoft Mail Provider with Microsoft Exchange version 4.0, Windows clients, logon to the postoffice. This automatically downloads mail from your mailbag into your Microsoft Exchange Personal Information Store (.PST file) and deletes the mail from the mailbag on the postoffice.