“Gmail ignores dots entirely in the local part. This is not an RFC standard. It is Gmail-specific behavior.”

Google does this all the time. They ignore parts of a spec, and by their sheer scale cause problems for other software. I’ve seen this first hand in their fonts and PDFs. I don’t know if it’s arrogance or maliciousness, but it’s one more reason for me to dislike them.

Now quiz yourself!

https://e-mail.wtf/