Recently, a number of users reported that they encountered sender email address 550 rejected due to a server error.
If shoppers receive a 550 rejected (or blocked) error when they try to send an email, it means that the spam filter has blocked the message. In this case, you may need to take steps to whitelist your email as not spam.
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How do you fix 550 this message was classified as spam and may not be delivered?
This is often due to the inability of SMTP authentication in Outlook. You need to make sure SMTP authentication is configured in Outlook and the username is just your full name An email address with a password for your trading email account.