Accidentally sent the draft email.

Corrupted data, client pressures, and looming deadlines work to combine into a lurking potential for disaster in direct mail campaigns. Sometimes that potential gets realized in hilarious fashion when one small thing, one very little thing, is inadvertently overlooked in the maelstrom inherent to getting a project of such nature underway. Such was the case here.

In the early 1990s, a small UK-based company that performed bureau work for direct marketing campaigns on behalf of third parties did indeed make the “Dear Rich Bastard” gaffe. That gaffe came about after the company had undertaken a project to assist one of the largest UK telecom companies in launching a new ‘gold’ calling card, a project that included drawing information from a database in order to address and personalize letters tendering the product to prospective customers.

And therein lay the trap. As potential wordings were bandied back and forth, the work on the actual data extraction program had to continue, and some placeholder phrase needed to be assigned for use with records containing munged name field data. A whimsical programmer hit upon his own temporary salutation for such records: “Dear Rich Bastard.”

Read more at 'Dear Rich Bastard' Letter | Snopes.com

Moral of the story, with most computer documents, never to make a joke in a draft. I think you are fine with edits, everyone understands.