1 \begin{tabular}[hbt]{| l || p{3.1em} | p{4em} | p{3.2em} | l | p{6em} |}

2 \hline

3 \MTA\ & first release & regarded version & lines of C code & architecture & design goals \\

4 \hline

5 \hline

6 \sendmail\ & 1983 & 8.14.3 & 92k & monolithic & flexibility \\

7 \hline

8 \exim\ & 1995 & 4.69 & 85k & monolithic & generality, flexibility, extensive checking \\

9 \hline

10 \qmail\ & 1996 & 1.03 & 14k & modular & security \\

11 \hline

12 \postfix\ & 1999 & 2.5.6 & 87k & modular & performance and security \\

13 \hline

14 \masqmail\ & 1999 & 0.2.21 & 10k & monolithic & non-permanent Internet connections \\

15 \hline

16 \end{tabular}