On 2023-09-10 at 04:28:38 UTC-0400 (Sun, 10 Sep 2023 15:28:38 +0700)
Jesper Hansen via Postfix-users <seabreeze...@gmail.com>
is rumored to have said:
[...]
Then, about an hour later, I got this message to postaster@mydomain:
----- Transcript of session follows -----
<test-6y2o9s...@srv1.mail-tester.com>... Deferred: Connection timed
out with reception.mail-tester.com.
Message could not be delivered for 1 hour
Message will be deleted from queue
Reporting-MTA: dns; spamfilter-02.totbroadband.com
Arrival-Date: Sat, 9 Sep 2023 18:06:26 +0700
Original-Recipient: rfc822;test-6y2o9s...@srv1.mail-tester.com
Final-Recipient: RFC822; test-6y2o9s...@srv1.mail-tester.com
Action: failed
Status: 4.4.7
Remote-MTA: DNS; reception.mail-tester.com
Last-Attempt-Date: Sat, 9 Sep 2023 19:17:35 +0700
I have sent 3-4 mails to mail-tester, but this is the ONLY time, I
have and any response. Actually the ONLY response at all to my 20-30
mails to various recipients.
What’s suspicious here is the "Reporting-MTA: dns;
spamfilter-02.totbroadband.com” line.
TOT is my ISP here, and I cannot fathom how THEY are in some way
involved with my mail, neither sending or receiving.
They are capturing and redirecting port 25 traffic from your system to
their MTA, which has severe deliverability problems. If most of the
traffic through that poor machine is hijacked mail like yours, it is
also almost certainly mostly spam, so it is understandable that most
other places won't take their connections.
I simply sit on their fiber and does not relaying anything through
them.
Yes, but your packets traverse their routers and can be hijacked.
Can someone help me shed light on what’s going on and why my emails
are “blocked” somewhere down the line.
I hope this helps... Your only fix for this is to get your ISP to stop
hijacking your port 25 traffic. They are doing that to prevent spam
coming from their network, which is good. They may also be doing that to
provide incentive to individuals like yourself to buy a more expensive
grade of service that allows mail to flow unmolested.
Incidentally, this was also a trick used by AOL for years, back around
the turn of the millennium. That example was followed by many smaller
operations who didn't have any of AOLs mitigating attributes.
--
Bill Cole
b...@scconsult.com or billc...@apache.org
(AKA @grumpybozo and many *@billmail.scconsult.com addresses)
Not Currently Available For Hire
_______________________________________________
Postfix-users mailing list -- postfix-users@postfix.org
To unsubscribe send an email to postfix-users-le...@postfix.org
