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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 \RF1: In/out channels & ++ & - & + \\
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6 \hline
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7 \RF2: Mail queue & ++ & - & + \\
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8 \hline
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9 \RF3: Header sanitizing & 0 & - & - \\
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10 \hline
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11 \RF4: Aliasing & 0 & - & - \\
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12 \hline
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13 \RF5: Route selection & + & - & 0 \\
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14 \hline
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15 \RF6: Authentication & ++ & + & +++ \\
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16 \hline
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17 \RF7: Encryption & ++ & + & +++ \\
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18 \hline
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19 \RF8: Spam prevention & + & ++ & +++ \\
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20 \hline
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21 \RF9: Malware handling & - & + & 0 \\
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22 \hline
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23 \RF10: Archiving & - & + & 0 \\
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24 \hline
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25 \hline
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26 \RG1: Security & ++ & + & +++ \\
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27 \hline
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28 \RG2: Reliability & ++ & + & +++ \\
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29 \hline
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30 \RG3: Robustness & + & + & ++ \\
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31 \hline
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32 \RG4: Extendability & + & ++ & +++ \\
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33 \hline
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34 \RG5: Maintainability & + & 0 & + \\
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35 \hline
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36 \RG6: Testability & 0 & 0 & 0 \\
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37 \hline
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38 \RG7: Performance & -{}- & - & -{}-{}- \\
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39 \hline
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40 \RG8: Availability & - & - & -{}- \\
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41 \hline
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42 \RG9: Portability & - & -{}- & -{}-{}- \\
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43 \hline
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44 \RG10: Usability & + & -{}- & - \\
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45 \hline
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46 \end{tabular}
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