Re: [ALUG] More about sendmail sending to local machine

Jonathan McDowell wrote:

You shouldn't use a CNAME for a host that you want to receive mail. I suggest you try changing it to an A record instead.

To quote RFC1123 section 5.2.2: The domain names that a Sender-SMTP sends in MAIL and RCPT commands MUST have been "canonicalized," i.e., they must be fully-qualified principal names or domain literals, not nicknames or domain abbreviations. A canonicalized name either identifies a host directly or is an MX name; it cannot be a CNAME. Can someone explain why this restriction exists (or point to a good resource)? Regards, -- Chris Lamb, UK chris@chris-lamb.co.uk GPG: 0x634F9A20