501 Too many syntax or protocol errors – Outlook / Outlook Express

Issue Error Messages:
SMTP call from (workstation) [xx.xx.xx.xx] dropped: too many syntax or protocol errors (last command was “RCPT TO: 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’ Solution:
When sending emails using outlook you might receive the error above. It seems that when you copy & paste the email addresses into the To field, they include quotations around them that the server did not know how to handle (i.e. ‘name@website.com’ instead of just name@website.com). Remove the quotations & then try sending emails.

Was this answer helpful?

 Print this Article

Also Read

Domain has exceeded the max defers and failures per hour

What is this error?If you are receiving an error similar to "Domain example.com has exceeded the...

Setting up autoresponders while you are going out on vacation

Introduction: This guide will walk you through the process of setting up an autoresponder in...

Set up POP3 email on Windows Phone

Please follow the following instructions to set up a POP email on a Windows PhoneNOTE: If you are...

What is RBL?

RBL is short for Realtime Blackhole List, a list of IP addresses whose owners refuse to stop the...

Configure iPhone and iPad for email

On your iphone home screen tap the settings icon Tap on Mail, Contacts, Calendars Tap on Add...