I am experiencing an error when trying to send mail to certain hosts from my VPS. Here is an example:
SMTP error from remote mail server after MAIL FROM:<[email protected]> SIZE=1409: host recipienthost.com [173.236.30.130]: 550 Access denied - Invalid HELO name (See RFC2821 4.1.1.1)
I am using exim4 and sendmail. At first I thought it was my host name, so I changed that from a numerical value to my website address.
Does anyone know what's wrong and what I need to do?
Thank you.