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They also started using new IPs without PTR records to send out mail. Though so has Microsoft just recently. Both heavily frown upon that when receiving mail themselves. Do as we say...
I hate getting a report telling me my work domain is blocked because it is missing a PTR record and we use Exchange Online. I can’t do anything about that!
They also started using new IPs without PTR records to send out mail. Though so has Microsoft just recently. Both heavily frown upon that when receiving mail themselves. Do as we say...
But things like icloud, office365, google workspace and similar are "too big to fail", right? They don't have to play by the same rules as the rest of us peons.
as referenced here, from the post on the 'mailop' mailing list
https://news.ycombinator.com/item?id=43512353
This is either an astonishing level of technical fuck-up from what has to be an entire work group of people with six figure salaries whose jobs are nothing but running email server infrastructure, so they must clearly know better, or a lack of regard for the internet community and accepted standards. I really cannot think of a third possible explanation for it.
To be clear for those people who don't run their own email servers: Having proper reverse DNS for the IP of your outbound SMTP sending server is one of the absolute bare minimum requirements for accepted mail flow, and is a standard that's probably 25 years old or older now. It significantly pre-dates SPF, DKIM, DMARC and all the rest. Proper RDNS is literally one of the first things you verify before you set up everything else.
Earlier quoted context omitted.
I hate getting a report telling me my work domain is blocked because it is missing a PTR record and we use Exchange Online. I can’t do anything about that!
Sure you can. For instance, I don't use Exchange at all.
The only issue that I have with iCloud+ with my custom domain is about two gmail accounts which I don’t get mail from. It’s super weird.
My bizarre email issue is about gmail, not iCloud, but I'm hoping someone clueful can weigh in. In my gmail inbox I periodically get very strange emails from mailer-daemon@googlemail.com, addressed to username+caf_=username=example.com@gmail.com (where "username" is my gmail user, and "example.com" is the domain of a consulting client from a decade ago that gave me username@example.com) The body of these weird messag…
Earlier quoted context omitted.
Sure you can. For instance, I don't use Exchange at all.
Yep, whenever I start a new job I say "Don't worry, because iamverysmart, you don't need any Microsoft products!" I am then hailed as a genius, everyone claps, and I get a big fat raise.
They also started using new IPs without PTR records to send out mail. Though so has Microsoft just recently. Both heavily frown upon that when receiving mail themselves. Do as we say...
I hate getting a report telling me my work domain is blocked because it is missing a PTR record and we use Exchange Online. I can’t do anything about that!
So, Apple sends the wrong EHLO domain when trying to send emails out. This results in them dropping emails to their own users. Can't get past Apple's level 1 support. How can I get to someone that maintains their SMTP k8s cluster?
We usually ask around on the NANOG mailing list. Someone on that list usually already knows the contact method or a person at an ISP, datacenter or hyperscaler. https://nanog.org/resources/nanog-mailing-lists/
What's different?