The email alert has this text:
You will not receive any further emails about this thread until read the new messages.
I suspect there is a "you" missing from between "until" and "read"; i.e.:
You will not receive any further emails about this thread until you read the new messages.
Or even:
You will not receive any further emails about this thread until you have read the new messages.
You will not receive any further emails about this thread until read the new messages.
I suspect there is a "you" missing from between "until" and "read"; i.e.:
You will not receive any further emails about this thread until you read the new messages.
Or even:
You will not receive any further emails about this thread until you have read the new messages.