Meaning they can just strip out the dots when matching email addresses: either on login/signup or mail routing.
But the cause of that appears to be user error -- people thinking they own email addresses that are not actually theirs.
Please, please give an example..
Also, read this..
https://support.google.com/mail/answer/7436150?hl=en#zippy=%...
> if your email is johnsmith@gmail.com, you own all dotted versions of your address
> If anyone tries to create a Gmail account with a dotted version of your username, they'll get an error saying the username is already taken.
> Your account is still private and secure. Emails sent to any dotted version of your address will only go to you.
They never had an email address with or without dots that's made up of the same letters as your email address. Their email address is probably very different (maybe they forgot to add a number, or a middle initial, or typed Gmail when they should've typed Outlook). The dots are just a stylistic choice.
The point is that without the dots rule I'd never get those emails, and the senders would get their message bounced back right away.
You can write rules on f.oo to go a different path than fo.o.