Ralf Doeblitz wrote:
This is incorrect. The fqdn given as parameter to EHLO must
be a primary host name, not an alias:
RFC 2821, section 3.6
Thanks for the correction, I confused this with 2.3.5: "For
example, a domain may refer to an alias (label of a CNAME RR)
or the label of Mail eXchanger records to be used to deliver
mail instead of representing a host name."
Or with the intro of 3.6: "In other words, names that can
be resolved to MX RRs or A RRs (as discussed in section 5) are
permitted, as are CNAME RRs whose targets can be resolved, in
turn, to MX or A RRs."
But then it continues "There are two exceptions to the rule
requiring FQDNs", and the EHLO FQDN MUST resolve to an A if it
is no domain literal.
<joke> Is an IPv6 EHLO limited to IPv6 domain literals ? </>
Bye, Frank