Email problem sending out mail

After sending mail, it leaves the outbox as normal and clears and hits the
sent folder, but then I get a popup box that states
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>
EMAIL PROBLEM
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One or more e-mail messages cannot be sent.
>
Details
>
View the log
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>
After you verify the format of your recipient addresses, McAfee recommends
that you resend those messages from your e-mail program. \
>
>
>
I have tried resending with the same result. When I did a test message to
send to myself, I had not problem receiving or sending the mail???? What
in
the world is going on?? Help?
>
B
>
>
>
>

After sending mail, it leaves the outbox as normal and clears and hits the
sent folder, but then I get a popup box that states
>
>
EMAIL PROBLEM
>
One or more e-mail messages cannot be sent.
>
Details
>
View the log
>
>
After you verify the format of your recipient addresses, McAfee recommends
that you resend those messages from your e-mail program. \
>
>
>
I have tried resending with the same result. When I did a test message to
send to myself, I had not problem receiving or sending the mail???? What in
the world is going on?? Help?
>
B
>
>
>
>