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I am considering migrating from Google Workspace to iCloud+. On the email front, I have a domain and I use "plus addressing" in my Google managed email addresses. For example, one user account email address is [email protected], and I use [email protected] to receive emails from some services into [email protected] mailbox.

I'm wondering if iCloud+ supports the +tag syntax for custom domains, similar to Google Workspace or Microsoft365. I've seen some people mention using iCloud+'s aliasing feature to achieve a similar result, but I have too many tags to map them all in this way. I also have a catch-all feature set up, but this would not work for me because I have multiple users on the domain using the +tag syntax and I don't want emails for [email protected] to go to [email protected] - they should go to [email protected] instead.

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A simple test from my iCloud email account to myself with a tag ("myaccountname[email protected]") worked as expected - i.e. the test email was received AOK at "myaccountname@icloud.com"

So iCloud email handling does conform to RFC2822 (§3.2.4) as one would hope.

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    I can confirm that I tested this right now and used filters to move mail into a sub folder and it is working.
    – unknowndomain
    Commented Jan 13, 2023 at 0:33
  • Thank you for sharing experience and confirming on an iCloud.com address. My question though is if I use a custom domain instead of an iCloud address. I like the reference to the RFC2822 but no guarantee iCloud+ will conform to it yet
    – Zeugma
    Commented Jan 14, 2023 at 3:22
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    I have done another test with my custom domain and, yes, it works. The test was sent to "tagged+test@_mycustomdomain-_.uk" and it was received AOK.
    – Eric
    Commented Jan 15, 2023 at 7:29
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    I've just tested my own custom domain with this and can also confirm that this works, even with catch-all disabled. Message sent and successfully received to [email protected].
    – Maximillian Laumeister
    Commented Feb 18, 2023 at 19:03

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