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Postfix Documentation
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Simple content filter performance

With the shell script as shown above you will lose a factor of four in Postfix performance for transit mail that arrives and leaves via SMTP. You will lose another factor in transit performance for each additional temporary file that is created and deleted in the process of content filtering. The performance impact is less for mail that is submitted or delivered locally, because such deliveries are already slower than SMTP transit mail.

Postfix Documentation
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