Replies are not stored in sent folder. Thunderbird Keeps Changing the folder from Sent to Other

Hi ioippnrpxfbn,

The “[TRYCREATE] Mailbox doesn't exist: Sent” message is the most useful clue here. It suggests Thunderbird is trying to use a folder called “Sent”, while your StartMail account may actually be using “Sent Messages”.

Since this only affects the StartMail account, I would check the folder Thunderbird is configured to use rather than reinstalling Thunderbird again.

In Account Settings for the StartMail account, go to Copies & Folders and check which folder is selected under “Place a copy in”. Make sure it points to the actual “Sent Messages” folder on the StartMail server, rather than a folder named “Sent”.

If Thunderbird keeps changing the selection back to “Sent”, that would be particularly useful to know. It may indicate that Thunderbird is not correctly recognising StartMail's special-use Sent folder.

Could you also check the folder's Properties in Thunderbird and look at the IMAP location/path? If you post what it shows for both “Sent” and “Sent Messages”, we may be able to work out exactly what Thunderbird is seeing.

Hello Max,

Thank you for your response. I appreciate your assistance.

I was able to temporarily fix this a couple of days ago. I clicked on 'Other' and then sent messages for my StartMail account. However, shortly after making those changes, they reverted by themselves.

Is it possible that there is something in the config editor that was affected?

Hi Max

Is this what you had asked me for ?

imap://....%40startmail.com@imap.startmail.com/Sent

imap://....%40startmail.com@imap.startmail.com/Sent Messages

Thanks

Hi ioippnrpxfbn,

Yes, that is useful. It confirms that Thunderbird is seeing two separate server folders:

Sent Sent Messages

The important part is that the error says Thunderbird is trying to use “Sent”, while your messages appear to belong in “Sent Messages”. Thunderbird's Copies & Folders setting controls where it places copies of sent messages, and for an IMAP account you can select the specific server folder under “Other”.

Since you have already selected “Sent Messages” and Thunderbird later changes it back to “Sent”, I would not change anything in Config Editor yet. That behaviour itself is the useful clue.

Could you check one more thing: right-click the “Sent Messages” folder in Thunderbird, choose Properties, and tell us what is shown for its IMAP location/path and whether it is subscribed?

If “Sent Messages” is the correct StartMail folder and Thunderbird keeps reverting the setting to “Sent”, that may point to Thunderbird incorrectly identifying the server's Sent folder rather than simply being a local profile problem.