If you look at the top right corner of this page you will see an are that tells you about the number of new posts and PMs. If you click the private message link, open the message in question and select reply you will be able to pm the sender back.
Once you know where things are it's easy lol

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Just got a notification from Gmail that it failed to deliver due to
Quote:
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PERM_FAILURE: SMTP Error (state 10): 550 Invalid recipient
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Are you sure of that email address and do you have a hotmail account or anything that can be tried?
I take it that the email address you sent me is the same one that all your contacts are using?
Can you double check the information in Outlook Express accounts to make sure the email address is correct for the account that you are sending from.