Sendmail – How to Specify Outgoing HELO

emaillinuxsendmail

How do you specify the FQDN (Host and Domain Name) that a mail server presents itself as in HELO/EHLO when sending outgoing email with sendmail?

Best Answer

I added the following in sendmail.mc:

define(`confDOMAIN_NAME', `mail.foo.com')dnl

and then:

m4 sendmail.mc > sendmail.cf
service sendmail restart

I also verified that this worked with the email verifier service at http://www.port25.com/domainkeys/ (auth-results@verifier.port25.com). Neat service, you send it an email and it replies to the from header with information about your SPF, Domain Keys, etc...

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