Optimum Online does not recognize email addresses for sending mail

We just got the new iMac for our family. I decided to junk eudora and use apple's mail client. I have 3 accounts: mine (admin), my wife, my son. My wife and son can both receive mail via Mail but they cannot send. My son gets "This message could not be delivered and will remain in your Outbox until it can be delivered. The server "mail.optonline.net" rejected the address "Gregory Sohanchyk" " I reinstalled eudora so my son can send and receive. Queried cablevision but have yet to receive a response. Any one else having problems with other accounts and cablevision and optimum online.

Pull your mail plist from ~/Library/Preferences

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Hi murrxx,
Based on my experience, it just cannot send to the un-recognized email address. The remaining recipients will recieve the email.
Please changing to OWA to verify whether all the mails cannot be sent.
If in OWA, just the un-recognized email address cannot be sent, it should be an issue on the Outlook Client side.
Please run Outlook under safe mode for testing.
Also try to re-create new profile to refresh the caches.
Is there NDR returned back to us when we cannot send emails to all?
If has, please post the details.
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Mavis Huang
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Server does not recognize email address

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Hi remembering email address,
If you're using Send via Adobe Reader, you can take advantage of your local contact list. Please see I’m trying to send a file from Adobe Reader, but I can’t access my computer’s address book to find my contacts. Why not? for more information about that feature.
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http://en.kioskea.net/forum/affich-17997-ipod-not-detected

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Optimum Online does not recognize email addresses for sending mail

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