dovecot 2.3.1 (8e2f634)
When the PC is initially started, the following error message is displayed:
doveconf: Error: t_readlink(/var/run/dovecot/dovecot.conf) failed: readlink() failed: No such file or directory
After this, dovecot starts normally.
I cannot find any apparent reason for this error message, including the fact that it only occurs on initial boot-up of the machine. Subsequent restarts of dovecot work correctly.
*** This bug has been marked as a duplicate of bug 225078 ***