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Afaik the period thing is a Gmail thing while the plus thing is in the RFC.

However it appears the IAB UID2 README says to only normalize pluses/periods for gmail.com addresses: https://github.com/IABTechLab/uid2docs/blob/main/api/README....

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There is an RFC but it just mentions + as an example of a possible sub-address separator when discussing sub-addresses in Sieve filters. Whether or not + acts as a sub-address separator is server-dependent.

Oh good find, of course they can make a special rule for gmail, which is such a large portion of email addresses it's worth it.

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