You can uninstall or removes an installed gpg-remailer package itself from Debian 9 (Stretch) through the terminal,
$ sudo apt-get remove gpg-remailer
If you would like to remove gpg-remailer and it's dependent packages which are no longer needed from Ubuntu,
$ sudo apt-get remove --auto-remove gpg-remailer
If you use with purge options to gpg-remailer package all the configuration and dependent packages will be removed.
$ sudo apt-get purge gpg-remailer
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 gpg-remailer
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