Linux SMTP – Configure Exim4 HELO/EHLO Host Name

domain-nameeximlinuxsmtp

Mails from my system are being rejected when the receiving server does HELO checking. I believe my system is sending the wrong domain name. I'm running exim4. Googling for anything about exim4 and domains yields a nightmarish list of irrelevant results. Similarly, googling for HELO rejections yields a horde of outlook users who need to turn on SMTP authentication. I cannot for the life of me figure out this simple question: which hostname is exim sending and how do I change it?

Unfortunately, I can't watch what exim is sending over the wire, so I have no way to debug this myself. I'm hoping someone has had this problem and just knows :).

Best Answer

Assuming the error is complaining about the HELO/EHLO data, you want to use the helo_data option on the smtp transport. The default is $primary_hostname.

remote_smtp:
    driver = smtp
    helo_data = host.example.com

More information is available in the manual.

If this isn't the case, you probably want to include some example rejection messages. Just the three digit code and the string after that.

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