501 Too many syntax or protocol errors - Outlook / Outlook Express
Posted by Chris S., Last modified by Chris S. on 13 February 2014 11:46 AM

Issue Error Messages:
SMTP call from (workstation) [] 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’

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. ‘’ instead of just

Remove the quotations & then try sending emails.

(90 vote(s))
Not helpful

Comments (2)
Jamie Bishop
21 July 2016 01:08 AM
The address book seems to add the quotation marks from ACT when I try to set up a group email... how do I stop it doing that pls?
sanjay bhatt
19 December 2016 07:06 AM
thanks .. it works
Post a new comment
Full Name:
CAPTCHA Verification 
Please enter the text you see in the image into the textbox below (we use this to prevent automated submissions).