[Solved] [FC5] "Sender address rejected" for just about all email now

[Stuart]

> This is postfix not being able to resolve the claimed domainnames that
> folks are using in their mail.  What happens when you check the domain
> name of a failed sender address with host.
>
> eg  for joe at example.com try "host exampleXXX.com".
>
> bash-3.1$ host exampleXXX.com
> Host exampleXXX.com not found: 3(NXDOMAIN)
>
> If your dns can't find even well-known domains (say redhat.com ;-))
> then you'll want to fix that first.  Postfix should then fix itself
> perhaps after a restart/reboot.
>
> I just run bind (aka named) locally.  Using some isp's server usually
> creates problems like the above.

Thanks Wolfgang!

Yes, it was a typo in my resolv.conf. So while a "dig domain.tld"
found the MX and A records and an "nslookup domain.tld" found the NSs,
a "host mit.edu" rendered nothing.

And yeah, I've configured BIND to serve local (LAN) NS && DHCP
services, while the resolver refers to external (WAN) NSs for external
lookups.

Thanks again :-)

Stu@