"In February 2006, Linda Callahan, a resident of Ashfield, Massachusetts, was initially prevented from registering her name with Yahoo! as an e-mail address as it contained the substring allah. Yahoo! later reversed the ban."
I got nothing for "mocha", though. Edit: apparently (from below) there was a Yahoo! mail filter that replaced "expresso" [sic] with "mocha"; but either the story was misreported or the mail filter was wildly misconfigured. So the entry should be "expresso" [sic], perhaps.
