When to delete the local mail.box
We were getting a few strange sounding reports from a user who was trying to send email to 3 groups.
The first message was:
“A copy of this message was sent to 180 recipient(s), but the Internet format of this message was not sent to the following 34 recipient(s);
The second message was:
“Document has invalid structure: mail.box”
We closed the client, deleted mail.box, opened the client, and let it re-create mail.box and all was fine.