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Today I noticed this line in my message log: Apr 26 08:19:38 gmc-mxd-bsd-001 postfix/smtpd[80576]: NOQUEUE: reject: RCPT from unknown[]: 554 Relay access denied; proto=SMTP It's not new to me how spammers dig for open SMTP relays. I wonder though that their providers wouldn't notice such an obvious thing like "" by its name and pay attention to it. Even though we don't have millions of mailboxes at my company, regurlar pattern matching is run against our database to find the more obvious ones. Maybe it won't do any harm to anyone if IP addresses that try unauthorized relaying in globo were to be blacklisted right away.
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