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qmail-smtpd: Validation of recipient mailbox names.
[qmail] / PIC.relaybad
1 qmail-smtpd     Receive message by SMTP from another host:
2                    
3                    MAIL FROM:<spammer@aol.com>
4                    RCPT TO:<bill@irs.gov>
5                 
6                 Is $RELAYCLIENT set? No.
7                 Is irs.gov in rcpthosts? No.
8                 Reject RCPT.
qmail mail transport (local modifications)