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. Please contact your Internet service provider since part of their network is on our block list (S3140). You can also refer your provider to http://mail.live.com/mail/troubleshooting.aspx#errors. [AM5EUR03FT014.eop-EUR03.prod.protection.outlook.com]
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
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.
I’ve noticed that the big mail outfits don’t take complaints seriously from small volume-mailers. They seem to assume that you’re either a big mail outfit with a ton of volume to feed their algorithms or you’re spam.