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E-mail error: 421 Unexpected failure, please try later
Just accepted prompt to upgrade to NIS 2011 and now I am getting e-mail errors when sending e-mail from Outlook 2007. The message: "421 Unexpected failure, please try later" appears in a Norton dialogue box, but the message still moves to Sent Items in Outlook. Now I am left wondering whether the e-mail has actually been sent. No message from Oultook to say anything is wrong. Doesn't happen every time.
Any idea what might be causing this?
If I can't fix the problem is there an easy way to roll back to 2010?