[Dovecot] Problem with opening ports in alpha5 ?

[Bruce A. Mallett]

If I leave the "listen" value as the default in /etc/dovecot.conf I'll
get a message similar to the following on each port that it tries to
open during startup:

# dovecot -F
Fatal: listen(::, 143) failed: Address already in use

If I set either:
    listen = *

or
   listen = [::]

then it will start up fine.  Perhaps it is as though the code tries to
open the port twice for both ip4 and ip6?

    - Bruce