I have been told not to work with you in Outlook

I have been told not to work with you in Outlook

So typically you will get an “SMTP Error 550 571” or an “SMTP Error 550 5.7.1”. SMTP Error 571 is almost always the recipient’s server telling your sending server that “it has been told not to work with you !”.The explanation text which follows the error response

 usually does a good job of telling you why the remote server does not want to work with your server (typically it will be because your server/email-address is not whitelisted, or you are not allowed to send messages through this ISP’s SMTP server without providing authentication, relaying not permitted, or your server is on an RBL blacklist).


Typical SMTP 571 responses are : “5.5.0 SMTP; 571
Delivery not authorized, message refused” or “550 5.7.1 Mail from Ip_Address refused by blackhole sitedialups.mail-abuse.org” or “571 email address we do not relay” or “550 5.7.1 Relaying prohibited”.
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how to Syntax error command not recognized in Outlook

Syntax error command not recognized in Outlook

SMTP Error 500 : The last command sent by your server was not recognized as a valid SMTP or ESMTP command, or is not formatted in the way the server expected. This includes situations where the command is too long. Note that commands that are recognized, but not implemented, are handled by different status messages (see 502 and 504).


Note : A “500 unrecognized command” server response is often a case of antivirus software and/or firewall
interfering with incoming and/or outgoing SMTP communications. Read your antivirus / firewall software
documentation thoroughly to solve the problem. Examples of SMTP Error 500 error messages : “SMTP
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