Qmail-usermap-patch lets external mail exchanges validate user mappings before sending mail to a local delivery host.
This patch has an added benefit of providing the user map securely to external hosts via Secure Shell (SSH). This strong security measure ensures that the user map is not compromised, protecting both the host server and its users from potential harm.
Overall, qmail-usermap-patch project is an excellent addition to the qmail software for anyone who prioritizes security and efficiency. By reducing the amount of spam and lessening the burden on the server, this patch could prove to be invaluable in streamlining mail exchange processes.
Version 1.0: N/A