Description of problem:

Dovecot will disconnect remote clients immediately because of a wrong default 10-master.conf. I verified this with #dovecot on Freenode. Solution is below.

Version-Release number of selected component (if applicable):

2.0.17 (684381041dc4+)

How reproducible:

Is reproducible. See below.

Steps to Reproduce:

Use VirtualBox to setup dovecot on a Fedora guest, then verify that you may connect from the guest itself. Now forward e.g. port 11011 on the host to 110 on the guest and try to connect from the host. Will get disconnected immediately.
  
Actual results:

Getting disconnected immediately after being connected.

Expected results:

*Not* being disconnected immediately after being connected.

Additional info:

Problem is "address = localhost" for inet_listener pop3 { ... }, inet_listener imap { ... } etc. in 10-master.conf. Uncommenting those lines solves the problem:

service pop3-login {
  inet_listener pop3 {
    #port = 110
    #address = localhost # allow plain imap only on localhost
  }
...

service imap-login {
  inet_listener imap {
    #port = 143
    #address = localhost # allow plain imap only on localhost
  }
...