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Tips to Reduce Hard Drive Usage

Here are some tips on how to reduce the amount of hard drive space for mail: 

  • If you are on IMAP, unsubscribe from folders that are infrequently used by selecting "Subscribe..." from File menu. 
  • Delete older messages that are no longer needed. 
  • Empty your Trash and Junk folders. 
  • Periodically compact your folders by selecting "Compact Folders" from the File menu. Additionally, you can set thresholds for when folders should be automatically compressed by going to Preferences|Options / Advanced / Network & Disk Space / and set a lower number for compacting.
  • You can prevent message bodies from being indexed on an account-by-account basis. Go to Preferences|Options / Accounts / [your account] / Local Storage and deselect indexing for message bodies.

Additionally, if you are using Gmail:

  • Limit the number of messages that appear in IMAP folders. This can be adjusted at Gmail on the Web / Settings / Forwarding and IMAP tab / Folder Size Limits. Try setting these limits to a smaller number.
  • Unsubscribe from the Gmail "Important" folder if you are not actively using that label. 
  • Consider unsubscribing from the All Mail folder, and use a different folder for Archiving. 
  • Consider using Postbox Topics instead of Postbox Labels, as each time you use a Gmail Label it creates another copy of the message in Postbox.