Now I know why American Express wanted my email address: to send me spam.
Each and every time I log into the Amex web site, the site begged me for my email address. I finally gave them one just see what would happen, and I even carefully set my preferences to make certain I would receive only the most essential communications such as messages about potential fraud in my account.
Overnight — Saturday night, the time when in Internet tradition spammers would emerge while system administrators had some time off — Amex sent me spam about one of their marketing programs. I've disabled the email address they're using, and no doubt they'll whine about it next time I log in.
I do have to marvel: what type of fool deliberately sends spam from to a customer who has taken the time and trouble to warn in advance that he doesn't want any? I'll think about this while I consider the move to a new credit card provider, one that respects my privacy.