9
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1 \begin{tabular}[hbt]{| l || c | c | c |}
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2 \hline
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3 Requirement & Importance & Pending work & Focus \\
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4 \hline \hline
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5 RF\,1: In/out channels & ++ & - & + \\
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6 RF\,2: Mail queuing & ++ & - & + \\
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7 RF\,3: Header sanitizing & 0 & - & - \\
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8 RF\,4: Aliasing & 0 & - & - \\
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9 RF\,5: Route management & + & - & 0 \\
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10 RF\,6: Authentication & ++ & + & +++ \\
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11 RF\,7: Encryption & ++ & + & +++ \\
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12 RF\,8: Spam handling & + & ++ & +++ \\
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13 RF\,9: Malware handling & - & + & 0 \\
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14 RF\,10: Archiving & - & + & 0 \\
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15 \hline
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16 \end{tabular}
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