R. Scott Perry wrote:
> This isn't a reverse DNS lookup issue. They are expecting that the host
> name you send in your HELO/EHLO text be a valid host listed in DNS (which
> is *should* be, but in practice often isn't). I know that the SIMS
> mailserver has a problem with this. I believe that the RFCs state that a
> mail server can't reject mail based on the HELO/EHLO text.
You're absolutely correct.
RFC 2821 in '4.1.4 Order of Commands' states:
An SMTP server MAY verify that the domain name parameter in the EHLO
command actually corresponds to the IP address of the client.
However, the server MUST NOT refuse to accept a message for this
reason if the verification fails: the information about verification
failure is for logging and tracing only.
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