Hi Bill,

This is the expected behaviour in UC 7.x and it looks like

2.1(2) as well

User Has a Full Mailbox

If a user mailbox is no longer allowed to receive messages, Cisco Unity Connection handles the message
in one of two ways:

• By default, when an unidentified caller attempts to send a message to a user whose mailbox has
exceeded the send/receive quota, Connection still delivers the message. You can instead configure
Connection to indicate to the caller that the recipient mailbox is full, and prevent the caller from
recording a message for that recipient. (In Cisco Unity Connection Administration, on the System
Settings > Advanced > Conversations page, check the Full Mailbox Check for Outside Caller
Messages check box.)

If the recipient mailbox has not yet exceeded the send/receive quota at the time an unidentified caller
records a message, but the quota is exceeded in the act of delivering the message, Connection
delivers the message regardless of the quota.

• When a user tries to leave a message for another user whose mailbox has exceeded the send/receive
quota, Connection allows the user to record and send the message. However, if the mailbox for the
recipient is full, he or she does not receive the message, and if the user account for the recipient is
configured to send non-delivery receipts when message delivery fails, Connection sends the
message sender a non-delivery receipt.

If the recipient mailbox has not yet exceeded the send/receive quota at the time a Connection user
records a message, but the quota is exceeded in the act of delivering the message, Connection
delivers the message regardless of the quota.

From this good doc;

http://www-search.cisco.com/en/US/docs/voice_ip_comm/connection/7x/troubleshooting/guide/7xcuctsg120.pdf

Cheers!

Rob