This should help you out:
http://www.outlook-tips.net/howto/delete_rr.htm

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Milly Staples [MVP - Outlook]
Post all replies to the group to keep the discussion intact. All
unsolicited mail sent to my personal account will be deleted without
reading.
After furious head scratching, Roy asked:
| Hello,
| I mistakenly selected "yes" to sending a read receipt response
[quoted text clipped - 6 lines]
| Thanks,
| Roy
Roy - 29 Apr 2007 06:38 GMT
Thank you. I changed the SMTP server and that did the trick.
Roy
This should help you out:
http://www.outlook-tips.net/howto/delete_rr.htm

Signature
Milly Staples [MVP - Outlook]
Post all replies to the group to keep the discussion intact. All
unsolicited mail sent to my personal account will be deleted without
reading.
After furious head scratching, Roy asked:
| Hello,
| I mistakenly selected "yes" to sending a read receipt response
[quoted text clipped - 6 lines]
| Thanks,
| Roy