Postfix is a great e-mail server and you would usually want to keep up with new versions more aggressively than RedHat publishes RPMs for new version. However, I have never succeeded well in compiling Postfix from source with SASL support enabled. The resulting binaries (compiled towards the RedHat SASL rpms) always seem to core dump and mis-behave for reasons I have never understood.However, there is a solution… building an RPM from source and using that RPM for updating.

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Our mail server receives around 10.000 e-mails per day. On weeekdays around 70% is spam, during weekends more than 90% is spam. Lately our mailserver load has been very high leading to poor reponse times. As a result we decided to implement greylisting.

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Now I have finished a PAM module for sending One-Time Passwords (OTPs) via SMS when using Pluggable Authentication Module (PAM) in Linux.

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