Setting a proper E-Mail connection for XigmaNAS to send status reports and health informations via
System -> Extended -> E-Mail Settings
disallows anyone to delete those credentials once set in case they have to be deleted. In my personal environment I handed over administration of a box and needed to delete the E-Mail credentials set to my department and personal E-Mail accounts, not knowing those person/s who would mutually takeover. A workaround is to set some fake E-Mail credentials - otherwise the GUI is rejecting any changes towards empty fields.
For the email just put a space in the email fields and save
For the email report just disable it, delete the fields and save.
There is a forum for such questions.
just put a space in the email fields and save