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

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...

Automating Email Sorting into Specific Folders using Webmail

Effectively managing emails is a key part of maintaining a clutter-free inbox, especially in a...

How to build a DMARC record

Introduction This is a basic guide on how to craft a DMARC record for your domain. For more...

Managing registered email address for scripts

We have enabled a tool that restricts the email IDs which can be used for sending emails through...

What is RBL?

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