How to reduce the size of the mail box:

To reduce the size of your mail file, you have a few options.
What do you want to do? Procedure
Automatically archive unused messages 1. Open your mail, select Actions > Archive > Settings > Criteria, and either edit existing criteria or create new criteria. This criteria will tell Notes which documents to archive and what to do with them.
2. After editing or creating, select the desired criteria from the list and click Enable.
3. If you have access, set an archiving schedule on the Schedule tab. Click the check box next to Schedule archiving, and then choose a time to run archiving. You must leave your computer on at the time you schedule.
Manually archive unused messages Follow the first two steps for automatically archiving unused messages.
During step one, for Selection Criteria, select Selected by user. Make sure to enable this criteria.
At any time after this, select the messages you would like to archive, and then select Actions > Archive > Archive selected documents.
Automatically delete unused messages Follow the steps for automatically archiving unused messages.
When you create or edit the archiving criteria, select Just clean up this application without archiving.
Manually delete unused messages Follow the steps for manually archiving unused messages.
When you create or edit the archiving criteria, select Just clean up this application without archiving.
Automatically reduce unused messages Follow the steps for automatically archiving unused messages.
When you create or edit the archiving criteria, select Reduce the size of documents in this application, and make a selection from the corresponding drop-down list.
Manually reduce unused messages Follow the steps for manually archiving unused messages.
When you create or edit the archiving criteria, select Reduce the size of documents in this application, and make a selection from the corresponding drop-down list.