Re: [9front] Mailing list mails completely lost?

[Stanley Lieber <sl@stanleylieber.com>]

On June 25, 2021 2:02:11 PM EDT, Kurt H Maier <khm@sciops.net> wrote:
>On Fri, Jun 25, 2021 at 10:22:26AM -0400, Stanley Lieber wrote:
>> I still see a lot of:
>> 
>> 1ess Jun 25 10:15:09 delivery '/net.alt/dns' does not exist (net!bss-wf.de)
>> 
>> in the logs. this is not just you; many, many delivery attempts end up as similar entries in /sys/log/smtp.fail. I still don't know why this is happening. I'll try to rig some extra logging to see once and for all what is going on.
>
>Which DNS resolver are you querying?  I presume not 9cloud, but I used
>to have problems with assholes returning AAAA records that were useless.
>
>khm
>

we've been seeing similar behavior for a long time. that "'/net.alt/dns' does not exist" error shows up *a lot* in the logs, frequently for hosts that do exist and whose hostnames do resolve on the command line.

a month or so ago, as an experiment, I switched from opendns.org servers to running a local resolver. it goes like this:

# should work with only -n, but doing so breaks domain resolution for the local system
ndb/dns -nrs

and in /lib/ndb/local:

sys=1ess dom=1ess.inri.net
ether=525400099935 ip=216.126.196.35                                                      
ipmask=255.255.255.0                                
ipgw=216.126.196.33                                    
auth=216.126.196.35                                    authdom=yoyodyne                               
#       dns=208.67.222.222                             
#       dns=208.67.220.220                                     
dns=216.126.196.35                                     
mx=1ess.inri.net pref=5                                
txtrr="v=spf1 mx -all"

that said, I'm not entirely sure what goes on between all the little programs involved in mail delivery that access dns, or how to track same.

I also don't understand why /net.alt isn't found, since /net is mounted over /net.alt each time in tcp25 and tcp587 *before* running any mail commands (btw, the listener that runs tcp25 and tcp587 runs as user upas, not as user none).

sl