Version of Outlook? See Help, About if unsure.

Is it in his contact list or in the drop down that displays as he types a
name in the to field? That's the nickname cache and is only populated with
addresses he sent mail to. See
http://www.slipstick.com/problems/nicknamecache.asp

If the addresses are in his contacts folder, he has an add-in installed that
is adding addresses to his contacts.

--
Diane Poremsky [MVP - Outlook]
Outlook Tips: http://www.outlook-tips.net/
Outlook & Exchange Solutions Center: http://www.slipstick.com

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"Erica" wrote in message
...
Well it is not happening on my computer but my boss is having the problem.
He
said it happened when he recieved a group email (our company newsletter)
and
after that all the people had been added to his address list. Now these
are
new email address and we do not have all our contacts switched over yet,
so
having so many in his list is not right. I don't know how to better
explain
it than that.

"Russ Valentine [MVP-Outlook]" wrote:

Outlook does not and cannot do this. Provide your evidence and a clearer
description of what you think is happening.
--
Russ Valentine
[MVP-Outlook]
"Erica" wrote in message
...
All the email addresses are automatically added when I recieve an email
from
a group, how do I stop this?