Gmail IMAP Attachment Errors

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Several people who are using Gmail's fairly new IMAP feature have reported problems opening attachments through Thunderbird.  Word and PDF documents, and possibly others, generate an error saying that they are "unable to open".  Apparently this has something to do with Gmail reporting an incorrect size for the attachment.   The same attachments open fine when using the Gmail Web interface instead of Thunderbird.

 Here is the fix for this ...

  • Tools > Options... > Advanced > General > Config Options
  • Search for "chunk"
  • You should see a preference named "mail.server.default.fetch_by_chunks". Toggle it to false.
  • Close and restart.

I found this solution buried in Google Groups

6 responses to “Gmail IMAP Attachment Errors”

  1. mike Says:
    Thanks for this!
  2. juank Says:
    Worked for me! Thanks!
  3. andrew Says:
    Thanks mate - that worked a treat.
  4. ophir Says:
    Works! Thanks so much!
  5. Travis Says:
    Works for exact same issue with GoDaddy IMAP.
    Thank you, I have been going crazy for weeks
  6. watch family guy online Says:
    I often read your blog and always find it very interesting. Thought it was about time i let you know…Keep up the great work

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