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usepackage{tabularx}

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begin{document}

begin{table}
sffamilysmall
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centering
begin{tabularx}{textwidth}{|C{3cm}|C{1.5cm-tabcolsep}|C{1.5cm-tabcolsep}|X|}
hline
multirow{2}{=}[-.5cm]{centering Email addresses} &                             multicolumn{2}{C{3cm}|}{Did the information gets posted on the Google Calendar?}  & multirow{2}{=}[-0.5cm]{centering Notes}\
cline{2-3}
 & Yes & No & \
hline
rinshi246@ gmail.com &  & checkmark  & The time is not specified whether it is am or pm, so it does not appear on Google Calendar.  \
hline
devspecsniper@gmail.com &  & checkmark  & The time is not specified whether it is am or pm, so it does not appear on Google Calendar.  \
hline
idislikeperiods@gmail.com &  & checkmark & The time is not specified whether it is am or pm, so it does not appear on Google Calendar.  \
hline
335basurahan@gmail.com &  & checkmark & The time is not specified whether it is am or pm, so it does not appear on Google Calendar.  \
hline
lubotsabaso@gmail.com &  & checkmark & The time is not specified whether it is am or pm, so it does not appear on Google Calendar.  \
hline
paltik357@gmail.com & checkmark &  & The information gets posted on Google Calendar.  \
hline
storethefileshere@gmail.com &  & checkmark & The information didn't plot on the Google Calendar even if it was a time interval. It should be corrected.  \
hline
fitzmerlduron@outlook.com & checkmark &  & The information gets posted on Google Calendar.  \
hline
screwelectronics@yahoo.com &  & checkmark & The information didn't plot on the Google Calendar even if it is a weekday and time is mentioned. It should be corrected.  \
hline
gapalanay227@gmail.com &  & checkmark & The information didn't plot on the Google Calendar even if the information is enough. The information shown in this context must be recognized by the app and should be corrected.\
hline
end{tabularx}
caption{Google Calendar's responses to different email accounts.}
label{table-test6}
end{table}
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end{document}