We have a remote UNIX server out on someone's cloud...let's say it has IP address 11.22.33.44 for argument's sake....and the sender is "*** Email address is removed for privacy ***". Yes, this is not a routable email address...but we don't need to send email back to it.
This notification process works fine on all our other servers with no problem, but not this one. When it generates system status messages to our organization's outlook email system, it get's rejected by Microsoft Exchange with email messages saying :
.mail.protection.outlook.com[23.103.198.10] said: 550 5.7.606
Access denied, banned sending IP [11.22.33.44]. To request removal from
this list please visit https://sender.office.com/ and follow the
directions.
Of course our server 11.22.33.44 is not configured to receive mail, so the process where this thing asks for mailing address, and I enter the full "*** Email address is removed for privacy ***" email address fails...because that domain is not routable and mail can't come in.
However, if I enter my own personal email address : my-name@org-domain
...I actually do get the email, and then I successfully UNBLOCKED IP address 11.22.33.44.
Wait...
How does Microsoft know that my-name@org-domain is AUTHORIZED to unblock that un-connected IP address 11.22.33.44 ??
Does this mean that if we block someone from spamming us, then they can unblock themselves, or anyone else so long as they have an email address?
