Reducing spam at Postfix SMTP layer on Debian servers

At this fourth article on the antispam subject, we will go to another layer of defense.

Configuring Postfix SMTP server to help in reducing spam have advantages and imposes some risks.

Stopping spam at SMTP layer has the advantages of reducing server load, server network bandwidth comsumption, and better dealing with botnets of windows machines and open relay servers.

At other side, a sysadmin could exhagerate in some restrictions and then loose some valid messages.

Finding the right balance is the key.

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