If you turn off the option to use EDNS, does it work?
You can find the option by going to Setup / Server Settings / DNS, uncheck the option for “Use EDNS0 (Extension mechanism for DNS).”
From: md-configuration@mdaemon.com [mailto:md-configuration@mdaemon.com] On Behalf Of Phillip Lynch (lists@eapop.com.au)
Sent: Tuesday, January 7, 2020 5:07 AM
To: md-configuration List Member <md-configuration@mdaemon.com>
Subject: [md-configuration] MDaemon 19.5.3 x64: DNS server reports incorrect packet format
We recently upgraded a few MDaemon servers to 19.5.3 (from 19.5) and have experienced a problem with one.
Specifically, it can’t resolve DNS addresses when trying to send, receive or collect multipop messages. The failure message is always “DNS server reports incorrect packet format”.
This was working prior to the MDaemon upgrade (and through many other upgrades spanning several years) and no other configuration changes were made.
The problem clearly relates to the internal DNS server (a Fritz Box) because we were able to work around the issue by having MDaemon use another external DNS service.
The puzzling thing is that the internal DNS server is working correctly in every other situation (browser, DIG, Dropbox etc) and on the device running MDaemon.
There is no real problem leaving the setup as is. However, we’d like to understand why MDaemon has started rejecting DNS responses from this one source.
Advice or debugging suggestions would be welcome.
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