Re: anyone on from hotmail.com, msn.com, live.com smtp?

[Robert Story <rstory () isi edu>]

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/>