It appears that Kevin A. McGrail via mailop <kevin.mcgrail-mai...@pccc.com> 
said:
>Gmail treats dots as non-existent. 

These dots aren't in the Gmail address.  They're in the return address in the 
message.

>On 5/2/2024 3:02 PM, John Levine via mailop wrote:
>> While debugging something else, I've been trying to send messages to myself
>> from the address a...@m.jl.ly.  RFC 5321 says two dots in a row need to be
>> quoted, and I have checked that my mail system does indeed put in the quotes
>> and it says
>>
>> MAIL FROM:<"a..b"@m.jl.ly>
>>
>> But Gmail still doesn't like it, with the error message suggesting that 
>> something at
>> their end stripped the quotes too early   Huh?
>>
>> Outlook/Hotmail accepts it but puts it in the spam folder which I guess is 
>> OK.
>>
>> R's,
>> John
>>
>> Connected to 2607:f8b0:4004:0c17:0000:0000:0000:001a but sender was rejected.
>> Remote host said: 553-5.1.7 The sender address <a...@m.jl.ly> is not a valid 
>> RFC 5321 address. For
>> 553-5.1.7 more information, go to
>> 553-5.1.7  https://support.google.com/a/answer/3221692 and review RFC 5321
>> 553 5.1.7 specifications. 
>> e5-20020a0562141d0500b0069b3262b75fsi1739474qvd.226 - gsmtp
>>
>>   ...
>>
>> Return-Path: <"a..b"@m.jl.ly>
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