Error in sending emails on outlook

Hello,

am facing issue in sending emails from my outlook. am getting this message instead of sending my mails.

Your message did not reach some or all of the intended recipients.

Subject: RE: follow up to phone call
Sent: 3/6/2023 12:47 PM

The following recipient(s) cannot be reached:

'Chuck Cole' on 3/6/2023 12:47 PM
503 Valid RCPT command must precede DATA