[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.