When we enter an email address into the field: (WAF - Logging And Reporting) Email this address on successful back-end login
We get an error: An error has occurred - 0 invalid address - Return to Control Panel
We saw a related issue: https://www.akeebabackup.com/support/admin-tools/25103-an-error-has-occurred-0-invalid-address-return-to-control-panel.html
But to us this is the opposite. We get an error when we enter an email address.
I have this issue only on 3 of my website.
My other website don't have this issue. And I use the same configuration for Admin Tools for all my websites. I do that with the import function. So that's why I know the setting are all the same.
Hope you have a solution for this issue.
Kind regards,
Lumiga