Make sure dovecote is running
Aswell as do not bring back 4 months old threads to life 
. I moved it to a new one, as @eris already, check dovecot and the related logs.
Make sure dovecote is running
Aswell as do not bring back 4 months old threads to life . I moved it to a new one, as @eris already, check dovecot and the related logs.