The server responded: 501 Too many syntax or protocol errors’
The server's response was: "501 Too many syntax or protocol issues". This error may appear while sending emails using Outlook. Don'tworry we have the solution for you and here's what you should do.
Task ‘Mailer – Sending’ reported error (0x800CCC0F) : ‘The connection to the server was interrupted. If this problem continues contact your server administrator or ISP. The server responded: 501 Too many syntax or protocol errors’
The server's response was: "501 Too many syntax or protocol issues". This error may appear while sending emails using Outlook. There is a chance that you will see the above error while attempting to send an email through Outlook.
The server apparently has trouble with email addresses that have quote marks around them (such as "[email protected]" instead of "[email protected]"), which occurs when you copy and paste them into the To field.
Do not send emails until you remove the quotation marks. In other words, they're effective.