6 Oct
2021
6 Oct
'21
8:07 a.m.
On Wednesday 06 October 2021 02:31:59 am Dr. Nikolaus Klepp wrote:
Maybe some have alredy noticed: the new EU censorship
regime is randomly
blocking mails to mailinglist like TDE. I just had a talk with my mail
provider and it's not encouraging. e.g:
On Wednesday 06 October 2021 06:34:18 am Stefan Krusche wrote:
Indeed, in the last few weeks I've noticed some of
my mails to tde-users
vanishing. After a couple of days I got GMX's error message (my domain
is still registered with GMX) that the message couldn't be delivered or
some such. Therefore I got the impression that the filter/whatever is
on the other side at the receiving end.
Hi All,
This is probably part of the recent issues with people’s emails vanishing.
Doubtfully all though.
There was a configuration change to [something, I’m kinda guessing bind by
timestamp, but really exim seems the more logical culprit] around the 1st of
September that initiated blocking previously send-able mail to those mails
being blocked by “Deferred: 451 Temporary local problem.”
Two major issues with this, 1) the reject mail didn’t go anywhere off box*,
and 2) that message means little to a regular user.
* I had some mail being mailed and received by the same server, so was able to
see it in the logs.
I ended up putting sendmail into debug mode on two different servers to find
out that ultimately it was a bind lookup stating the sender domain could not
be verified, at which point sendmail couldn't/wouldn’t send it and would send
the error/reply at bottom.
The fix was to fix any issues you have with the sending email address's DNS.
Which if you have a third party provider, or they have internal pass through
servers, you can’t do, but for those of you who can here’s some commands that
should help.
# dig NS "$DOMAIN"
# dig @ns1.example.com "$DOMAIN"
# dig "$DOMAIN"
# echo "Subject: send mail to me" | sendmail -v myaddress(a)example.com
Note: Sendmail is kinda slow? Give it a couple/three minutes to complete its
thing. When you feel it should be done, hit “Enter” once to get your command
prompt back.
# # #
Think your ISP/mail host/government is censoring you?
Hosting your own domain for mail is 25-50 USD per year. Might even be
basically free (<$10) with dynamic DNS.
I am/do not affiliated/work for this company. Porkbun.com sells .com domains
at cost, but you can find TLDs for 3 or 4 USD per year as well.]
# # #
In the global scheme of things, the change would seem to actually reduce spam
loads (hopefully?), but ‘eh, who knows, spammers have never had problems
faking the sending email address anyway...
Hope that helps and lets see if this makes it through the new email maze...
Best,
Michael
Sanitized copy of error/reply mail:
Subject: Warning: could not send message for past 4 hours
Date: 09/01/21 12:50:24
From: Mail Delivery Subsystem <MAILER-DAEMON@{deleted}>
To: root@{deleted}
The original message was received at Wed, 1 Sep 2021 08:42:33 -0500
from localhost [127.0.0.1]
----- Transcript of session follows -----
... while talking to {deleted}.:
>> DATA
<<< 451 Temporary local
problem - please try later
srv09_csf@{deleted}... Deferred: 451 Temporary local problem - please try
later
<<< 503-All RCPT commands were rejected with this error:
<<< 503-Temporary local problem - please try later
<<< 503 Valid RCPT command must precede DATA
Warning: message still undelivered after 4 hours
Will keep trying until message is 5 days old
Return-Path: {deleted}
...