The ISP provider changed our IP address when we reset the modem.(even though they swear it was a fixed IP) The mailguard delivery address is fixed so the redirected mail from mailgaurd no longer had a valid address for delivery.
You can fix this by correcting the mailguard delivery IP address (phone them in business hours) or by providing Mailguard with a name address instead of an IP address .
Simple but frustrating until you think of checking to see if the IP addresses of your server and mailguard match
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