Emails do not work with Eaton 9PX 1000i RT 2U + Network M2 card

Hello,

We have two Eaton UPS units (9PX1000iRT2U,  5P1150) both with Network M2 cards running firmware version 1.7.5 . "Save & test server connection" and "Send test email" from the page Settings/Email work perfectly for both UPS units. I get "Notify on events" and "Periodic report" emails from the 5P1150 but not from the 9PX1000iRT2U. There are no errors in the system logs on the 9PX1000iRT2U. The SMTP settings are the same on both UPS units. Any ideas what can be wrong?

I noticed that the 9PX1000iRT2U shows "Used 100 %" for the processor on the page Card/Resources. For 5P1150 the processor showd "Used 28 %". I don't know if this is a problem
 and if it could be the reason for the email sending problems.

Johan