Email address "Auto Complete" overrides what I wanted.
Many software programs have a nifty feature of completing the email address soon after you start typing it. This is the Auto Complete feature.
This is a great option, when it gets the right address. It saves you a lot of typing.
FAQ's
Sometimes, the Auto Complete feature fills in the wrong information. It's possible your message was sent to the wrong address.
Check the Sent folder and review the message to verify what address was used.