MX vedouci na CNAME

[Jan Houstek]

> 	Existuje mnozstvi domen, ktere je takto konfigurovano, proc je
> to spatne? Existuje neco jako RFC, ktere se zabyva tim, jakym zpusobem
> ma MTA pomoci SMTP v zavislosti na DNS dorucovat postu - odporuje to
> tomuto... (snad tech zkratek nebylo prilis...:-))

Na http://cr.yp.to/im/cname.html se pise:

: RFC 821 prohibited all use of ``nicknames or aliases'' in domain names
: in SMTP requests. RFC 1123 specifically prohibited DNS aliases
: (domains with CNAME records) in MAIL and RCPT requests.

Asi nejvaznejsi duvod proc by tomu tak melo byt je uvadeno toto:

: Note that this does not work unless CNAME translation is supported by
: all clients; a message to www.your.site will bounce if the client
: fails to replace www.your.site with your.site.

A dale pokracuje takto:

: Most implementors agree that this feature is not worth the
: implementation costs.

Stejne diky za reakci, protoze jste me vasim dotazem donutil jeste jednou
zagooglovat a tentokrat uspesne. Presto se tesim na dalsi nazory ...

-- Honza Houstek