550 error received when replying to message sent to me

A

Annette

Hello. I own a small business and correspond to folks in
regularly in the US, Canada and UK. I received an e-mail
a week ago from a person in France asking about our
shipping costs. Her e-mail id is [email protected] . I
did a simply reply and the mail bounces back with
....while talking to smtp.wanadoo.fr:<<< 550 <[email protected]>User Unknown
550 5.1.1 <[email protected]>...User Unknown

I have tried sending my response at different times of
day. I have tried not using "reply" and just typing a
new message and typing her e-mail addy. I have stripped
all extraneous footer, font selections etc out of the
mail so it is nothing but a Times Roman font and it
bounces back. I am not a techie. If I have some type of
protocol problem, where should I start looking? This gal
just e-mailed me again today--thinking I have ignored her
message. It could happen again with correspondence with
another country so I need to try figuring this problem
out. Thank you so much for your help--in advance.
 
N

neo [mvp outlook]

Try sending a message to [email protected] and see if it gets thru
because the error message indicates that their server doesn't recognize that
e-mail address as anyone that uses their system. At the very least you can
ask them if the e-mail address you have for "X" is valid.

/neo
 
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