Sendmail sleeping during boot.

[Alexander Dalloz]

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?

Alexander