mail-tools
There are 2 repositories under mail-tools topic.
Aymen-XH/Email-List-Domain-Cleaner
This tool allows you to clean a list of email addresses by removing unwanted domains and suffixes. It provides a user-friendly interface for specifying the domains and suffixes to keep. The cleaned email addresses are then saved to an output file.
variablenix/mail-utils
a collection of some Dovecot mail utilities