Sendmail sleeping during boot.
Erik P. Olsen
erik at epo.dk
Fri Sep 22 19:48:46 UTC 2006
Alexander Dalloz skrev:
> Erik P. Olsen schrieb:
>
>> Thanks, so FQDN means that there MUST always be at least one dot in
>> the hostname. What if I use epo.dk, which is a public domain owned by
>> me, instead of your example olsen.intra? Does that cause any conflict?
>
> To your first question: that a FQDN has at least one dot is a result of
> its definition. Chris already gave a link. In addition
>
> http://www.unix.org.ua/orelly/networking/sendmail/ch21_02.htm
>
> If you use a valid, because public resolvable domain name there is
> always the risk that as effect a service request - here mail routing -
> goes a different route than you would expect and want to. I mean, if the
> resolvable domain name has DNS records poiting to different locations.
> To be specific: Sendmail does MX lookups and a query for your "epo.dk"
> domain gives a valid result:
>
> $ host -t mx epo.dk
> epo.dk mail is handled by 10 webhotel3.webhosting.dk.
>
> Sure, you can try to avoid such pitfalls by doing specific setup
> "tricks". But isn't it easier to simply use a namespace for your LAN
> where there is no risk it would be resolvable for any public meaning?
>
Yes, I agree and I think I have it all straight now.
And thanks to everybody who has participated in helping me out.
--
Erik P. Olsen, Civilingeniør, MSc
Solsortvej 30, DK-2000 Frederiksberg, Denmark
Phone: +45 38346480, Fax: +45 38346470, Mobil: +45 40765300
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