You can uninstall or removes an installed dovecot-core package itself from Ubuntu 16.10 (Yakkety Yak) through the terminal,
$ sudo apt-get remove dovecot-core
If you would like to remove dovecot-core and it's dependent packages which are no longer needed from Ubuntu,
$ sudo apt-get remove --auto-remove dovecot-core
If you use with purge options to dovecot-core package all the configuration and dependent packages will be removed.
$ sudo apt-get purge dovecot-core
If you use purge options along with auto remove, will be removed everything regarding the package, It's really useful when you want to reinstall again.
$ sudo apt-get purge --auto-remove dovecot-core