U.S. officials remain reluctant to confirm the e-mail's authenticity.

CNN: Conflicting reports on missing reporter's fate

Pentagon officials declined to be interviewed for this story, but they did confirm in an e-mail that the secretary of Defense has already barred two colleges from receiving federal funds for violating the Solomon Amendment.

NPR: U.S. Government Punishes Schools That Ban Military Recruiting

Liz Ryan, a former human resources vice president who now runs the online career community asklizryan.com, advises interns to confirm their expectations in an e-mail exchange before they start for the summer.

FORBES: Careers

Meanwhile, the journalist who took Casburn's call has said he gave evidence in the trial after taking advice from a union representative "only to confirm" that he had written an e-mail to superiors outlining the conversation.

BBC: April Casburn jailed for News of the World leak offer

All it would have taken is a phone call or an e-mail to a toxicologist to confirm that Good Guides' warning was groundless.

FORBES: Medialand

The U.S. government has refused to confirm reports that its intelligence agencies monitored Hasan's alleged e-mail contacts with al-Awlaki.

CNN: Hearing postponed over Fort Hood shooting suspect's beard

Once you tweet that confirmation hashtag, American Express will shoot you a confirmation e-mail and give you 15 minutes to confirm you want the product.

CNN: Twitter and Amex to let you pay with a hashtag

You get your pick of receiving either an automated phone call or an e-mail on the day before the appointment to confirm that you'll show up.

CNN: Analysis: Brace yourself for the e-scheduling revolution