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Preface | xxiii
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Acknowledgments
First and foremost, I must thank Greg Shapiro for his careful review of the new chapter
about Milters.
Bruce Mahand Sean Brennan were guinea pigs for the first and second editions,
respectively. Chris Fedde was guinea pig for the third edition. Scott Palmer bravely
functioned as guinea pig for the fourth edition. They set up and ran sendmail based
on early drafts and thereby uncovered omissions and mistakes that required correction.
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