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Thanks. The problem seems to be that the email does not have a sender,s address, hence the "unknown". It then goes into some kind of loop as it doesn't know who to senf the receipt to. Any ideas?

In Microsoft Outlook I received an email from a friend. When I opened it it requested a receipt request to "unknown" or NULL. I typed NO and Outlook closed itself. Later I tried to delete the item permanently but the receipt request was repeated and the item would not delete. I have also tried...