No not at all, just replaced with a random address.

So nothing from MS as of yet, best I have gotten is these two addresses to go and file complaints. It's been 2 days with no response, MS isn't so attentive it seems.

https://sender.office.com

https://support.microsoft.com/en-us/supportrequestform/8ad563e3-288e-2a61-8122-3ba03d6b8d75

So at this point we are just queuing up the messages waiting for MS to allow us to send again. What a pain.

On Sat, May 9, 2020 at 12:22 PM Robert Story <rstory@isi.edu> wrote:

On Fri 2020-05-08 19:35:08-0700 Joseph wrote:
> We are getting this messages when sending emails from our domain.
> We've submitted tickets, but haven't received a response yet. Anyone
> have any insights?
>
> 550 5.7.1 Unfortunately, messages from [1.1.1.1] weren't sent.

> It's our own address and everything on the Microsoft site says we are
> clean with no issues.

1.1.1.1 is your address? You are cloudfare's anycast dns server?

$ whois 1.1.1.1
[...]
inetnum: 1.1.1.0 - 1.1.1.255
netname: APNIC-LABS
descr: APNIC and Cloudflare DNS Resolver project

--
Robert Story <http://www.isi.edu/~rstory>
USC Information Sciences Institute <http://www.isi.edu/>