Gmail treats dots as non-existent.  So kevin.mcgr...@gmail.com and kevinmcgr...@gmail.com are the same account.

https://support.google.com/mail/answer/7436150?hl=en

HTH, KAM

On 5/2/2024 3:02 PM, John Levine via mailop wrote:
RAPTOR REMARK: Alert! Please be careful! This email is from an EXTERNAL sender. 
Be aware of impersonation and credential theft.

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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