Why are my replies to emails not sent ?

P

PeterJMcDevitt

I receive incoming email and log the ID of the sender into my Contacts. I
then send a reply to the same ID - but get message -
"Your message did not reach some or all of the intended recipients.

Subject: Test
Sent: 08/12/2004 17:14

The following recipient(s) could not be reached:

'email address of sender' on 08/12/2004 17:14
503 No recipient(s).
What to do ?
 
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