You can do that, just follow the procedure mentioned here:
Then open ~sogo/GNUstep/Library/SOGo/Templates/MainUI/SOGoRootPage.wox in
your favourite editor, look for the line containing "buildDate" and comment
is there a possibility to remove the "info" Symbol on the logon page? At
least the detailed version of my sogo install?
If the system is reachable over the web, there is no need to give anyone a
hint on software, especially if you could use it to implement an attack.