Google has a number of sending limits in place to prevent abuse of system, and to help fight spam. If one of your mail accounts reaches an abuse limit, the account will be temporarily unable to send mail.
Each Google Apps account can currently send to 500 external recipients per day. Google Apps for Business and Education users can send to 2000 external recipients per day. The email addresses can be distributed among the To:, Cc:, and Bcc: fields. Administrators can contact all user accounts within the domain by adding everyone in the domain to an email list.
Here are a few additional tips:
- Create multiple user accounts to send mail. For example, 'Admin1' and 'Admin2' can each send 500 messages to reach 1000 unique recipients. (On Google Apps for Business or Education, two accounts can reach 4000 recipients.)
- Stagger mass communications over the course of two days. For example, send messages to the allotted number of recipients on day one, wait for 24 hours, and send messages to another group of recipients on day two.
- In all editions of Google Apps, an individual message can be sent to a maximum of 500 external recipients at one time.
- If you use a POP or IMAP client (e.g., Microsoft Outlook or Apple Mail), you may only send a message to 100 people at a time.
If you receive 'Sector 5' error messages, please confirm that:
- Your users are entering the correct email address for each individual on the distribution list
- Each person has opted to receive information from your user
- Your users have included an 'unsubscribe' link in all mass-mailed messages
If you're sending mass mailings or using a distribution list, you may be interested in Google Groups. To learn more about this free product, please visit http://groups.google.com.
