Error saving to IMAP folder

[Peter Thomassen]

Hi,

I have been using dovecot for multiple years, without a problem so far.
I'm running version 2.0.19-0ubuntu2.2.

A few weeks ago, the following problem started. When sending an e-mail
with Thunderbird, the message is saved to the "Sent" IMAP folder after
sending it out. Every few days, this

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