you have specified to receive email alerts for "The registration status of an extension changes". Check extension 848. Could be a bad cable causing network issues or a bad switch port.
If you dont want to receive these email notifications, go to Settings > General > Email Notifications and remove any notifications you dont want to receive.
ahhm, but when i check the extension status its on green, is this can be related in 3cx phone for iphone? or mac, because in that extension, he has a iphone and the same time he also have in his Mac and iphone,
this does include an iPhone/Mobile Device. So I find those device often connect and disconnect to wireless networks. it would be best to turn that feature off
Settings->General->Email Notifications-> Registration status of an extension changes.
If something goes wrong, the person will find you.
because the user of the extension also receiving a email, in that setting to turn off the Registration status of an extension changes.,
also the extension user cant receive now the notification?