550 Invalid RECIPIENT address

M

M R

I have been receiving this error message:
Your message did not reach some or all of the intended
recipients.

Subject: xxxxx
Sent: 7/7/2004 9:34 AM

The following recipient(s) could not be reached:

'xxxx' on 7/7/2004 9:35 AM
550 Invalid RECIPIENT address: "email
address" does not exist

But the address DOES exisist. In this case I was replying
to a message sent to me. It doesn't happen all the time.
I have sent this person email before and it went through.
I have also sent other messages to other people that go
through sometimes and other times I get this error
message. I have disabled Norton Antivirus and resent the
message but I get the same error. I have shut down and
restarted. I have checked my settings. I am at a loss.
It's very frustrating.
 
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