I used to have Emails/Notifications working just fine with my old ISY. But since I upgraded to EISY, I can't seem to find the magic. I've tried several different login accounts and SMTP servers (icloud, outlook, gmail) but all I get are these (attached) cryptic error messages.

What is a "Malformed SOAP request"?  What does "Change of state failed: SID not found" mean?

My firmware and UI are both at loX v.5.8.0.

2 hours ago, dkaleita said:

My firmware and UI are both at loX v.5.8.0.

First I would update to the current firmware (5.8.4), while that alone might not fix the issue working with the current firmware can help limit other problems that have been addressed since your version. 
 

Then be sure to review the steps in the wiki for Gmail account setup. These were confirmed earlier this year. Some options might have changed slightly, but they still work. 
 

https://wiki.universal-devices.com/ISY994:Configure_Mail_Server_Settings#Configuring_gmail_Account
 

I’m not exactly sure what your errors mean as there isn’t specific meaning in the wiki for those errors and most mentions in the forums relate back to ISY994 issues, but might shed some light on what resolves them (I didn’t read many of the older posts….use Google Site Search to find them). 

Since using the eisy you might want to review using the Notification plugin and UD Mobile or even Pushover to get alerts sent to your mobile device rather than the older email method. 

Thanks!  I followed the guidance to set up and use an "App Password". Apparently, that was the secret ingredient I needed. It appears to be working now.