sockets created for lmtp

Was recently configuring lmtp to listen in the postfix spool for mail.

I set the socket as suggested in the documentation, however, when I
look at what sockets were created there was an additional one for
dovecot.

Since I made the change, my expectation would have been just the one
that I set up.

I doubt it impacts it negatively, but I wanted to understand if I
configured things correctly or not.

Thanks.

Mike