Is your e-mail client using Exchange for your mail server? Or are you
connecting to POP and SMTP servers? Are you connecting to your own
internal POP and SMTP servers, or to your ISP's servers?
You have changed the description of your problem. First it was that you
got some error message saying "undeliverable" (but didn't show a copy of
the actual error output so it is unknown if it an error from your e-mail
client or from whatever mail server that you are trying to use). Now
you're saying the problem is that test e-mails you send to yourself
*are* getting delivered but with no body (i.e., content). Or did you
mean you are getting a bounceback e-mail in which your original e-mail
is not shown? Not all bounceback messages will include the original
e-mail, or they may include only a partial listing, or the original
e-mail is an attachment.
You also mention that "it" (which is presumably your e-mail client)
doesn't remember some addresses. For the nickname that you enter in the
To, Cc, or Bcc fields, does it resolve to an e-mail address or do you
just see the nickname text? The text gets underlined (maybe not until
you move the cursor into the body field) if it finds that nickname;
otherwise, it's just text with no associated e-mail address. If you
right-click on the entry in the To, CC, or Bcc fields and select
Properties, is there an e-mail address listed? If no e-mail address is
listed, do you have that nickname defined under the Details tab when you
open that record in your Contacts folder? If the rest looks good, it
could be that your .NK2 nickname file is corrupted; delete it to have it
recreated. Info on the nickname file can be found by searching on
"nickname" at
http://support.microsoft.com for the Outlook product; a
couple KB articles that may be related to your issue are
http://support.microsoft.com/default.aspx?scid=kb;en-us;287623 and
http://support.microsoft.com/default.aspx?scid=kb;en-us;299962.