On Sat, Jan 30, 2021 at 09:39:01PM -0700, Bob Proulx wrote:
> My best guess is that your chroot does not have a working resolv.conf file.
Certainly a good place to start. The only odd detail is that the errors
are 5.3.0 errors, so the lookup returned a definitive "no such host",
rather than just failing to get an answer.
Another possibility therefore, is that the OP (who failed to post
"postconf -nf" and "postconf -Mf" details) has disabled DNS lookups
entirely, either in main.cf or in master.cf.
The correct (default) values of the relevant parameters are:
# "yes" is almost never the right setting.
#
disable_dns_lookups = no
# For MTAs setting mail directly to the Internet,
# "dns" is the only correct value
#
smtp_host_lookup = dns
The OP should probably post "postconf -nf" and "postconf -Mf" output
as explained in:
http://www.postfix.org/DEBUG_README.html#mail
--
Viktor.
