reply e-mails keep coming back to me

gabagoo

Major Contributor
This problem started last week and although it does not happen all the time it is very annoying. I reply back to a client with prices and then I get an undeliverable message. I then have to go and cut and paste thier e-mail into a new message and then cut and paste the info and that one always goes through? Is this a viral problem or just the internet?
 
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