mailman
                                Mailman is a GUI to help you manage your email accounts stored in a MySQL/MariaDB database.
                            
                        How to download and setup mailman
Open terminal and run command
                                            git clone https://github.com/phiilu/mailman.git
                                        
                                        git clone is used to create a copy or clone of mailman repositories.
                                        You pass git clone a repository URL. it supports a few different network protocols and corresponding URL formats.
Also you may download zip file with mailman https://github.com/phiilu/mailman/archive/master.zip
Or simply clone mailman with SSH
                                            [email protected]:phiilu/mailman.git                                    
                                    If you have some problems with mailman
You may open issue on mailman support forum (system) here: https://github.com/phiilu/mailman/issuesSimilar to mailman repositories
Here you may see mailman alternatives and analogs
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