Hi, On Mon, Jul 15, 2024 at 09:55:06PM +0800, Jeff Pang wrote: > > > > > I get: > > > > 0A032940922 657 Mon Jul 15 14:40:01 user1@mymachine > > (Host or domain name not found. Name service error for name=example.com > > type=MX: Host not found, try again) > > Any SMTP client which does not fall back to the A record when no MX records > exists is fundamentally broken.
I think a confusion here is that the /etc/hosts file is not DNS. Not all applications on a system will ask the NSS for host lookups; some do go straight to DNS (as directed by /etc/resolv.conf). So the assumption that putting an entry in /etc/hosts is just the same as an A record in DNS is not always true. It looks like OP has worked out how to tell Postfix not to use DNS, so it would obey a hosts entry. Thanks, Andy -- https://bitfolk.com/ -- No-nonsense VPS hosting
