QmailAdmin is a free software package that provides a web interface for managing a Qmail system with virtual domains. It provides admin for adding/deleting users, Aliases, Forwards, Mailing lists and Autoresponders.
In qmail, Qmailadmin is administrated by postmaster id, so if you forgot the postmaster's password or just need to reset it, run following command on qmail server with root priviliges:
# /home/vpopmail/bin/vpasswd postmaster@example.com
Labels: qmail, qmailadmin