No email delivered - Sender Domain not found (all DNS broken)
Posted: 14 Apr 2020 01:57
I'm not sure if this is something new as of a recent update, but just this morning I've woken to EFA not delivering anything from anyone. I'm running the same environment as I built months ago, now updated to 4.0.2. Up until yesterday everything seemed kosher. Today, external emails are rejected with the error shown:
On reviewing the configuration, nothing has really changed as far as I remember. There are some... weirdnesses, though.
Updating /etc/resolv.conf so that it has the correct nameservers instead of localhost doesn't fix it either, so there could be something else at play. Right now I've had to disable EFA to get mail flowing - which isn't ideal!
Note that I did find the other similar topics but I don't think they match:
Code: Select all
MAIL FROM: <sender@example.com>
250 2.1.0 OK
RCPT TO: <mailbox@example.com>
450 4.1.8 <sender@example.com>: Sender address rejected: Domain not found
- /etc/sysconfig/network-scripts/ifcfg-eth0 was a bit broken - note the missing double-quote:
But fixing that didn't help, and at least eth0 comes up now.Code: Select all
... ONBOOT="yes" IPADDR="192.168.1.41 PREFIX="24" #IPADDR="192.168.1.41" #PREFIX="24""
- Default name resolution doesn't work:
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$ nslookup gmail.com ;; Got SERVFAIL reply from 127.0.0.1, trying next server ;; connection timed out; no servers could be reached
Updating /etc/resolv.conf so that it has the correct nameservers instead of localhost doesn't fix it either, so there could be something else at play. Right now I've had to disable EFA to get mail flowing - which isn't ideal!
Note that I did find the other similar topics but I don't think they match:
- I already have in mailscanner.conf
Code: Select all
define('QUARANTINE_USE_SENDMAIL', false);
- The other post is pretty vague but seems to indicate a similar "fix"