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Starting Monday, I have had numerous clients using McAfee Email Security report rejected emails that state:
550 Validating Sender: bosauthsmtp17: Host ipaddress: No unauthenticated relaying permitted
550 5.7.0 Relay Access Denied
These are all emails that they've been able to email in the past. All rejections are coming from: MAILER-DAEMON@p01c12o148.mxlogic.net.
Sometimes, they can resend and it goes through, and for some, they cannot. I beleive this is part of the System Change over the weekend. I will be opening a support ticket.