550 not permitted to relay error sending to new Office 365 email accounts

An IT technician migrated a customer over to Office 365, including using the hosted Microsoft Exchange service for email. He followed the right steps, verified their own domain name, adjusted the MX record and added the right SPF entry. However, some people sending to this email domain were receiving a delivery failure report error (though…

Exchange mail delivery stops on Windows SBS 2003 with AVG

We have AVG 2013 successfully running on a number of client’s servers and our own servers, with no problems. However one particular client with SBS 2003 experiences intermittent email problems which always co-incide with an update to AVG. Symptoms include: Users saying they haven’t received any emails recently or their recipients haven’t received emails that…