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Feb 24th, 2000 14:01
Properly configured non-relaying qmail installations appear to fail some simpleminded relay tests. These tests assume that if the SMTP server doesn't reject MAIL/RCPT commands that could cause relaying in some MTA's, that the tested MTA might relay them. Because of qmail's modular architecture, it's not practical for the SMTP daemon to validate recipients at the time of submission. These potentially relaying recipient addresses will usually result in a bounce--not a successful relay--when qmail-send tries to deliver the message. For example, qmail-smtpd will accept mail addressed to: relaytest%[email protected] But it will usually try to deliver the message to a local mailbox called "relaytest%mail-abuse.org"--which will probably bounce. Some MTA's, notably older versions of sendmail, would rewrite such addresses as [email protected] and forward them.
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