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Error talking to SMTP server [421 resomta-po-07v.sys.comcast.net resomta-po-07v]

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Error talking to SMTP server [421 resomta-po-07v.sys.comcast.net resomta-po-07v]

I have been getting this error, or one similar, for ever a week now. Eudora is my preferred, but I am also getting the error in Outlook 2007. Cannot send email at all. Receive email just fine. NOTHING has changed on my end. Using submission port 587, never SSL, authentication is the same. I have noticed that numerous other using are now getting the same error. I'm assuming something has changed on Comcast's servers. Please advise. Thanks

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