Jam.py Postfix Aliases - Web App to manage only Postfix Aliases with a LARGE number of managed Domains (>hundreds).
Postfix Admin - Postfix Admin is a web based interface used to manage mailboxes, virtual domains and aliases.
ViMbAdmin - ViMbAdmin (pronounced vim-be-admin and meaning Virtual Mailbox Administration) is intended as an...
Modoboa - Modoboa is a mail hosting and management platform including a modern and simplified Web User Interface.
Virtualmin - It includes numerous features not in the GPL version (like script installers, resellers, HTML editor, an improved UI, mobile access, spam and virus filtering).
NeutronMail - Self-hosted server for the ProtonMail client.