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

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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@xxxxxxxxxxx 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@

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