Recommended IMAP Settings for Thunderbird on Google Mail

Via: Recommended IMAP client settings; Google Help

Yet also Google Mail “no longer supports” Thunderbird (or other IMAP clients)


In about:config

  • browser.cache.memory.capacity: 30720
  • mail.server.default.fetch_by_chunks: false


From the Tools menu, select Account Settings and highlight your Gmail address.

  1. On the Server Settingstab:Check for new messages at startup > checked
    Check for new messages every 10 minutes > checked
    When I delete a message > Mark it as deleted
    Clean up (“Expunge”) Inbox on Exit > leave unchecked
    Empty Trash on Exit > leave unchecked
  2. On the Copies & Folders tab in the When sending messages, automaticallysection:Place a copy in > leave unchecked
  3. On the Copies & Folders tab in the Drafts and Templatessection:Keep message drafts in > Other
    Other >[Your Gmail address] > [Gmail] > Drafts
  4. On the Junk SettingstabEnable adaptive junk mail controls > leave unchecked
  5. Click OKto save and close your account settings.If you’d like to to further enhance your IMAP experience, follow these additional steps:
    1. In the ‘Tools’ menu, open Options.
    2. On the ‘Advanced’ tab, open the General section.
    3. Click the Config Editor button.
    4. In the ‘Filter’ box, type ‘browser.cache.memory.capacity’
    5. Double-click on the browser.cache.memory.capacity entry to edit its value.
    6. Change the value to ’30720′ and click OK.
    7. Delete the text in the ‘Filter’ box and type ‘mail.server.default.fetch_by_chunks’
    8. Double-click on the mail.server.default.fetch_by_chunks entry to set its value to false.
    9. Close the ‘about:config’ window and then close ‘Options’ by clicking OK.