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Hildebrandt, Ralf(TR). Absolute Postfix : Patches Are for Qmail.San Francisco, CA, USA: No Starch Press, Incorporated, 2004. p viii.http://site.ebrary.com/lib/drexel/Doc?id=10077268&ppg=8

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Hildebrandt, Ralf(TR). Absolute Postfix : Patches Are for Qmail.San Francisco, CA, USA: No Starch Press, Incorporated, 2004. p ix.http://site.ebrary.com/lib/drexel/Doc?id=10077268&ppg=9

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Hildebrandt, Ralf(TR). Absolute Postfix : Patches Are for Qmail.San Francisco, CA, USA: No Starch Press, Incorporated, 2004. p 448.http://site.ebrary.com/lib/drexel/Doc?id=10077268&ppg=476