Possibly the inverter can no longer transmit data, so there is no data in the emails.
If nothing has changed on your Internet, this can usually be solved by rebooting the inverter once.
You do this as follows:
In the fuse box, turn off the inverter fuse.
Then set the black rotary switch on the left side of the inverter to 0 (turn quarter turn).
5-minute wait.
Then set the black rotary switch on the inverter back to 1.
Then turn the fuse in the fuse box back on.