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It looks to be working for me. Test email sent from my Mac using eM Client v9 which has been configured to send the email using my custom domain.

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Yes, I've done just that. I had been paying for email forwarding from NOIP to my Outlook.com email address. Looks like I can now cancel the NOIP email forwarding service because my emails will now be delivered direct to iCloud.
Were you successful configuring NOIP for your iCloud custom domain? If you were would you be willing to show screen shots of the configuration, hiding your personal data of course? I was able to get it configured on Dynadot but also need to get NOIP setup and there seems to be significant differences in how these 2 services work. Thanks of your help.
 
So how has been the reliability for you so far? I have noticed that some newsletters are not arriving to my inbox for some reason. Haven't mentioned other deliverability problems so far, but I am worried about missing DMARC.
 
Some letters are not arriving. Much less than on Gmail, fortunately. I tried to resolve the issue with the sender, but he refuses to send mail server error codes (if any) or mailer daemon replies. If you are able to discover what happens please post here.
 
I’m seeing some very strange behaviour. I’ve created a family shared domain, added my own and three other family member mail addresses from the domain. All very straightforward and for me everything works normally.

But for the three family members everything goes wrong. They all have the same symptom which is that they cannot receive mail. Not just on the new custom domain but on any of their iCloud mail address. The sender sees a bounce-back message informing that the mail cannot be delivered but there’s not a lot of useful information in the headers. The family accounts can send mail OK and in all other respects their email systems seem to be working, except for reception.

Removing the custom domain fixes everything. This is repeatable - tried a couple of times.

I’ve opened a support case with Apple who so far have been useless. Waiting nearly a month now and after repeated requests for an update they have nothing to say other than “Our Engineers are still investigating…”

I’ve suggested to Apple that one key fact to consider is that this custom domain is the domain that all family members use for their Apple ID. Apple says this is irrelevant and it should still work.

Obviously this is now the live service, not beta. Anyone have any light to shed on this?
 
The last few days, I have been getting these messages when trying to move messages into other folders on my iCloud accounts. It's happening on macOS 12.4 and iOS 15.5 (iphone and iPad). The messages in question are real and many have simply vanished afterwards. Gone forever?
 

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Seems like it. mxtoolbox and dmarcian is reporting that I have DMARC enabled with policy quarantine.
@ELman @RamGuy Sorry I'm kind of confused. What do you guys mean by DMARC "supported"? It's late so maybe I'm just slow at the moment but I don't see how Apple would be able to prevent anybody using iCloud custom domain from adding a DMARC record (or prevent mail receivers from querying for and applying it).

My dad has wanted a custom email for a while so I snapped up his .com (which was somehow miraculously available despite his pretty common, short name) and set it up with the service since he already uses Apple One. Added a DMARC record via CNAME with policy reject and it's been working just fine (I review the XMLs occasionally and they're always all 3 passing), but now I'm kind of worried lol.

Anyway it's been working great for him, but in some areas Apple needs to step up their game a bit imo. They don't even mention DMARC in the documentation despite how important it is. They're also hell-bent on 1 hour TTLs for some reason (despite everyone moving towards 5 minutes or lower for various reasons -- btw I changed them all to 5 minutes and it unsurprisingly didn't cause any issues). Most bizarre thing is probably that they don't even let you manually add the DNS records (wtf). They also have IPv4 /15 blocks in their SPF record despite many mail platforms not honoring IP blocks larger than /16, lmfao. i guess you can flex like that when you own a friggin 8 block. Sorry this is just a random rant I'm so tired. (whoops almost forgot to mention the domain they're using for everybody's DKIM isn't registry locked... that's a disaster waiting to happen but Apple is far from the only company not registry locking critical domains)
 
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Catch-all email addresses are available on the beta site:

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You can also now see the aliases configured for family members.
I probably just being dense, but where exactly does one see that option?
 
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