4 ms·
In AT&T's case, it's because @att.com addresses were (are?) given to AT&T residential Internet customers, so they needed a separate domain so it's "clear" if an
by LukeShu 4y ago
In AT&T's case, it's because @att.com addresses were (are?) given to AT&T residential Internet customers, so they needed a separate domain so it's "clear" if an email is from AT&T itself or from a rando residential AT&T customer.