MAPI Result Code 21

SOLVED

I have specific clients that when I email, I get the MAPI error that outlook can't send the email.  I saw the earlier post about it, but I've had this issue for years but only when I specifically email certain clients. Is there a fix for this?  I was hoping the last update would fix it, but it didn't.  My Outlook is fine and yes, I have restarted my computer. I've had this error for years. I'd really rather not have to print and scan to email them.

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