Re: CNAME records (was: Re: dynamic DNS within a non-dynamic domain)
On 9 Mar 1998, Miquel van Smoorenburg wrote:
: Note that AFAIK all SMTP mailers (well, sendmail at least) will rewrite the
: addresses in the mail headers. That includes rewriting a CNAME pointer to
: the canonical name it points to.
: So even if you send out mail with the CNAME in the From: header field,
: the recipient mailer will rewrite it.. no way around it.
Well I get Remco Blaakmeer's mail as being "From: .. <remco@blaakmeer..>".
So it's going from his Smail system, to debian.org's Qmail and my ZMailer.
And none of them change the address.
Sendmail indeed does, but there are quite a few other MTA's out there, and
at least these three tend not to do it allways.
: The correct way to solve this is to not use CNAMEs but to just set
: up an extra A + MX record. Or perhaps just an MX record if all you're
: using it for is mail.
Ack.
bye,
Remco
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