MAGIC-SMTPD is a drop-in replacement for Dan Bernstein's qmail-smtpd. valid user checking to reduce server loads and spam volumes. It is designed to support stock qmail installations, qmail/vpopmail installations, and database connectivity.
The Postfix SMTP server receives mail from the network and is exposed<sep/>built-in and external methods that control what SMTP mail Postfix will accept, what mistakes to avoid, and
Address verification is a feature that allows the Postfix SMTP server to block a sender (MAIL FROM) or recipient (RCPT TO) address until the address has been verified to be deliverable.