[nicolas_t]

Same here, only issue I’ve ever had was when my email address had the name of the company in it in the format of [e-mail] CS people are sometimes confused by that and I’ve been accused of attempting to hack them by a small shop online because of my email.

[qingcharles]

Major SMTP provider refused my email address as login because of this. Luckily my moaning eventually made its way to one of their developers who fixed it.

You can't sign up for a Samsung account with the name Samsung anywhere in your e-mail address. Aliexpress another offender. There my email is just spam@domain.

[jmb99]

I used ali@domain for aliexpress, which was accepted.

[JCharante]

"Are you from corporate?" is what I often get when I need to give my email to a store associate.