I am unable to change SMTP IP address specified in Common Services > system preferences. Please advise.
Thanks and Regards
You shouldn't need to. Once you replace the regdaemon.xml file with the one I posted, you should be able to change the SMTP server from the GUI.
Back up your previous file.
stop services (net stop crmdmgtd, assuming you are on windows)
copy over new file
start services (net start crmdmgtd on the MS DOS CLI)
It's better to copy over this file with the fix, instead of editing yours. It's a very sensitive file and any format error or typo may corrupt the xml schema.