Troubleshooting Outlook error 0x80040201 when sending email
The email sits in the outbox indefinitely. This error may occur when a computer that was previously part of a Microsoft Exchange environment tries to send email to an address that was part of the same Exchange server but has been removed. As a result, Outlook tries to send an email to the alias or nickname associated with the recipient, instead of the valid email address for that particular recipient.
Method 1: Update all entries in the address book that was formerly part of the Exchange setup by ensuring that all related entries have a full, valid email address. Alternatively, just remove the contact from your contact list.
Method 2: Clear contents on Outbox Folder on Outlook.
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