Outgoing mail server failed to deliver this message

Question

This message appeared. I have not sent 400 messages. What's the deal??
""The outgoing mail server “smto,mac.com:jones” failed to deliver this message. 4.0.0 You have exceeded 400 recipients in the last 24 hours. Try again later.""
iMac G4   Mac OS X (10.2.8)  

Answer 1

You're welcome.
If you're a .Mac member using Mac OS X version 10.2.1 or later, you can synchronize the contact information between the Address Book application on your computer and your .Mac Address Book on the web. You can also synchronize your contact information between multiple Mac OS computers.
If you're using a version of Mac OS X earlier than version 10.4, you must have iSync installed on your computer to synchronize the information. To download iSync, go to
www.apple.com/support/downloads/isync.html
You can't synchronize the information in your .Mac Address Book if you have an email-only account.
To sync your .Mac Address Book:
Do one of the following:
If you're using a version of Mac OS X earlier than version 10.4, open iSync and click the .Mac button. Register your .Mac account, turn on .Mac synchronization, and then click the Sync Now button.
(Note: If you are syncing contact information between multiple Mac OS computers, use iSync to register all the computers you want to keep synchronized. For more information, choose Help > iSync Help when iSync is open.)
After the sync has completed, go to www.mac.com and click Address Book on the .Mac tab.
Click Preferences, and then select the "Turn on .Mac Address Book
Synchronization" checkbox.
Click Save.
With Address Book synchronization turned on, the contact information in your .Mac Address Book on the web and the Address Book application on your computer will be updated with any changes each time you sync.
You can turn off synchronization between the Address Book application on your computer and your .Mac Address Book on the web by deselecting the "Turn on .Mac Address Book Synchronization" checkbox. While this checkbox is deselected, changes you make to either address book are saved until the next time you select this checkbox and click the Sync Now button on the .Mac pane or in iSync. (For example, if you delete an address from your .Mac Address Book with this checkbox deselected, this address will be deleted from the Address Book on your computer's hard disk the next time you sync with synchronization turned on.)
If your kid has his/her own computer login account, one way to transfer selected contacts from your Address Book to your kid's address book is to create a folder on the Desktop named Contacts or whatever you prefer. Launch Address Book and one at a time, select a contact's name to highlight it and then single click and drag the contact to the created Contacts folder on the Desktop. This will create a vCard copy of the contact.
Using the Finder, go to Home > Shared. Place the Contacts folder on the Desktop in the Shared folder.
When your kid logs in to his/her account, the Contacts folder will be available in his/her Shared folder at Home > Shared.
Launch Address Book and at the menu bar, go to File > Import and select vCards. Navigate to/within the Contacts folder in the Shared folder and the vCards in the Contacts folder will be imported to your kid's Address Book.