Because most punctuation is stripped-out by the email protocol
Dots are one of the pieces of punctuation that are ignored
July 27, 2020 at 07:58PM
via reddit https://www.reddit.com/r/explainlikeimfive/comments/hz24y8/eli5_how_someone_can_misspell_my_email_address/fzgl8sv?utm_source=ifttt