Outlook: how to display the email address in TO:, rather than the account

I had a similar problem once when a user had been moved to a different Exchange cluster, but Outlook had cached the previous reference and kept trying to send to the previous cluster, even when I specifically selected the user from the Global Address list.

The way I fixed it was in Outlook, start typing the user's name until it auto-suggests the username, use the arrow key to select the name in the auto-suggest list and hit Delete. Try typing the name again and it shouldn't auto-detect it, so you can then select the user from the GAL.

These look like fairly normal NDR's to me. Invariably when sending bulk email you're going to get some failures due to: spam filtering on the remote system, mailboxes that no longer exist, mailboxes that are full, etc., etc. Here's my take on what you posted:

xxxxxxxx@earthkink.net Your message wasn't delivered because of security policies. This is likely due to a spam filter on the recipient's end.

xxxxxxx.xxxxx@verizon.com The recipient's e-mail address was not found in the recipient's e-mail system. This means that the user doesn't have a mailbox on the remote system or doesn't have an email address matching the one you sent to.

xxxxxxx@aol.com The recipient's e-mail address was not found in the recipient's e-mail system. Same as above.

xxxxxxxx@prodigy.net There's a problem with the recipient's mailbox. This could mean any number of things, such as the recipient's mailbox being full.