Thunderbird – Error Copying to Sent Folder

thunderbirdA user has complained about a problem with Thunderbird for a long time. The problem is that sometimes when the user sends a message, the message got sent but then a pop up window shows up saying “Error Copying to Sent Folder”. I thought it’s related to the mail server and did not pay close attention to it.

I did a google search on this problem yesterday and found this page. It looked promising, so I tried it on my user’s machine. The user has yet to encounter this problem after the changes. Here are the steps for Thunderbird

  1. Click on Tools -> Account Settings.
  2. Click on Server Settings under your account and then click on Advanced.
  3. Change Maximum number of server connections to cache to 1. The default is 5, just in case you want to change it back.
  4. Close all the dialogs and restart Thunderbird.

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