Long delays when deleting a message in inbox

Thu Apr 28 17:54:50 UTC 2016

Hi,

Since recently, there's a long delay when deleting any message from my 
inbox folder. This affects deleting and moving messages, but only the 
inbox of a single mailbox. The delay is a few seconds. Other operations 
work instantly.

The server is Ubuntu 14.04 running Dovecot version "1:2.2.9-1ubuntu2". 
The filesystem is local ext4. My MUA is Thunderbird on Windows, latest 
version, connecting with IMAP.

What could be the cause for this extreme delay?

Yves Goergen
http://unclassified.software