\chapter{Comparison of \MTA{}s}

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\section{First release}
sendmail: 1983

postfix: 1999

qmail: 1996 (first beta 0.70), 1997 (first general 1.0)

exim: 1995

masqmail: 1999

exchange: 1993


\section{Lines of code (with sloccount on debian packages)}
sendmail: 93k

postfix: 92k

qmail: 18k

exim: 54k

masqmail: 14k

exchange: (no source available)


\section{Architecture}
sendmail: monolitic

postfix: modular

qmail: modular

exim: monolitic

masqmail: monolitic

exchange: (unknown)


\section{Design goals}
sendmail: flexibility

postfix: performance and security

qmail: security

exim: general, flexible \& extensive facilities for checking

masqmail: for non-permanent internet connection

exchange: groupware


\section{Market share (by Bernstein in 2001)}
sendmail: 42\%

postfix: 1.6\%

qmail: 17\%

exim: 1.6\%

masqmail: (unknown)

exchange: 18\%
