I have a problem where my server is refused connection to another SMTP server because of its name. The name, dom_svr_2, has illegal characters in it.
The error is the following:
509 HELO/EHLO was syntactically invalid (dom_svr_2.mydomain.com). Check your configuration.
Is there a way I can have my server identify itself to other SMTP server using one name, for example mail.mydomain.com, and still retain its existing name on my internal network?
Subject: 509 HELO/EHLO was syntactically invalid
Yes, you have to register a Canonical Name Record (CNAME) on DNS.
ST
Subject: 509 HELO/EHLO was syntactically invalid
try this;
server configuration document
basics tab
fully qualified internet host name
set it to be what you want in the helo (what your dns a entry is), eg myhostname.mydomain.com
you can test if it’s working by unloading and loading the router task, it should display something like this;
Internet SMTP host myhostname in domain mydomain.com