A user received a bounced message with the following text when she sent an email:
Subject: Receipt for Mr. Kniestedt
Sent: Fri, 17 Dec 2004 13:34:40 -0600
did not reach the following recipient(s):
Mayela Gonzalez B. on Fri, 17 Dec 2004 13:35:40 -0600
The recipient was unavailable to take delivery of the message
The MTS-ID of the original message is: c=es;a=
So what does "the recipient was unavailable to take delivery of the message" mean? The email address is correct. Otherwise, the Microsoft Exchange server at the recipient's end would have replied "The recipient name is not recognized". In thise case, I believe it is because the recipient, Mayela Gonzalez, is over her quota for email on the Exchange server.
When a user is over quota and needs to delete some email, most other servers will respond with a message that clearly states the source of the problem, such as "the user has exceeded his quota" or something similar. The message from the Microsoft Exchange server, however, gives no immediately intelligible reason for the problem, but I believe it is because she is over her alloted storage space for messages on that server.
Unfortuntately, I've encountered other cases, also, where Microsoft programs ought to provide you details the program clearly must know, so that you can immediately understand what is causing a problem, but instead they provide some vague message like the one in this bounced message. Why is the user "unavailable to take delivery of the message"? Has she gone to lunch? The program producing the error message must know why it can't deliver the message to her, but doesn't deign to provide the details that would make the source of the problem clear.