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Stop spammers at the gate: Don’t blindly trust SASL authenticated connections

Hawk iMedia Posted on April 2, 2016 by Hawk iMediaApril 2, 2016

Recently a user’s email password was cracked. Not long after, she started receiving hundreds of bounce messages. My first thought was that these messages were back scatter, produced when spammers insert any random sending server address. So bounce messages are … Continue reading →

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Posted in System Administration | Tagged Postfix, smtpd_client_restrictions

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