[Pkg-exim4-users] 550 Access denied - Invalid HELO name (See RFC2821

Robert Steinmetz rob at steinmetznet.com
Fri Sep 12 18:48:14 UTC 2014

I am having trouble delivering mail to one server. All mail is rejected 
with the above error message. The message seems to indicate the 
receiving server is requiring strict RFC compliance and I am failing the 
reverse DNS lookup. But I'm not sure exactly which response it is 
expecting. I assume the name associated with the MX record, but the 
machine also has several DNS entries for different functions.

The receiving server is running ESMTP Exim 4.82

I am running ESMTP Exim 4.76 on Ubuntu 12.04. My configuration is in  

I have searched the web and tried a couple of things

I edited update-exim4.conf.conf and added


I added MAIN_HARDCODE_PRIMARY_HOSTNAME = smtp.mydomain.com to 

I ran update-exim4.conf and restarted exim4.

/etc/exim4/conf.d/mail/02_exim4-config_options contains the line 

/etc/exim4/conf.d/mail/02_exim4-config_options contains the line 
smtp_banner = smtp.mydomain.com ESMTP Exim $version_number $tod_full

  The problem remains.

I'm obviously overlooking something but I wonder what it could be.

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