Email addresses deleted after emails are "Undeliverable"

[egrwilson]

I have had email addresses deleted after sending emails that were returned
"Undeliverable." They are deleted from the auto complete AND in my Contacts.
I have looked everywhere for a setting that controls this with no luck. For
example, I sent an email with too many attachments to someone in address book
and whose address comes up automatically. I received a System:
Undeliverable message. When I went to resend a smaller file, the address was
missing from auto complete. When I went to find it in my Contacts - gone
from there too!

 

[Russ Valentine [MVP-Outlook]]

Outlook does no such thing. Tell us the rest of your story.