At 19:22 11/11/2004, Jeffrey Laramie wrote:
>Hi All-
>
>The mail server belonging to a client of mine "mail.client.com" uses another
>server "relay.client.com" to relay outgoing mail. mail.client.com appears to
>be correctly configured but relay.client.com doesn't resolve. Mail from this
>domain is bounced when it fails the XMail RDNS check. I'm trying not to piss
>off a client, but it's my understanding that according to standards the relay
>must have an A or CNAME record. Is this correct? If so, could someone point
>me to the rfc that states this so I can gently point this out to the client?
>I've been looking in RFC2821 but I'm not finding what I'm looking for.
RFC 2821, section 3.6
3.6 Domains
Only resolvable, fully-qualified, domain names (FQDNs) are permitted
when domain names are used in SMTP. 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. Local nicknames or unqualified names MUST NOT be
used. There are two exceptions to the rule requiring FQDNs:
- The domain name given in the EHLO command MUST BE either a primary
host name (a domain name that resolves to an A RR) or, if the host
has no name, an address literal as described in section 4.1.1.1.
- The reserved mailbox name "postmaster" may be used in a RCPT
command without domain qualification (see section 4.1.1.3) and
MUST be accepted if so used.
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