Re: Bounces?

Michael De Roover <[email protected]> Fri, 22 Aug 2025 12:46:06 +0200
Newsgroups	gmane.comp.xfce.user
Organization	workstation.vm.ideapad.lan
Message-ID	<[email protected]>
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On Thursday, 21 August 2025 02:21:26 CEST ToddAndMargo wrote:
> Hi All,
> 
> What is this constant message all about?  I do re-enable,
> but I am wondering what is causing them.
> 
> > Your membership in the mailing list Xfce has been disabled due to
> > excessive bounces The last bounce received from you was dated
> > 20-Aug-2025.  You will not get any more messages from this list until
> > you re-enable your membership.  You will receive 3 more reminders like
> > this before your membership in the list is deleted.
> 
> I did receive a post acknowledgement today (2025-08-20)
> 
> from the forum (before I re-enabled):
> > Your message entitled
> > 
> >     Re: My start and stop oneko script
> > 
> > was successfully received by the Xfce mailing list.
> 
> Is there something I can do to permanently fix this?
> 
> Many thanks,
> -T

A bounce is an SMTP response given by a receiving mail server. If I'm not 
mistaken, this would be the xfce.org mailing list as the sender, and zoho.com 
as the receiver. From there onwards, the emails are supposed to go into 
delivery to the user, first on server and then over IMAP. Often it's Microsoft 
and Google that would bounce email IME. It needs to be discussed with customer 
support for postmasters, or resolved through a form if they have one (e.g. 
JMRP for Microsoft, not sure about Google). Maybe Zoho has something like that 
too.

Judging from how they laid out their mail servers, they have 2 public-facing 
endpoints for it. Those endpoints are part of their own AS2639, which appears 
to be a large hosting provider. I'll attach a shell log showing how I came to 
these conclusions.

FWIW, I did receive your response about the oneko script. Thank you for that. 
I'll take a look at it shortly, perhaps over the weekend or next week. There 
are still a few things that need priority on my end.

-- 
Met vriendelijke groet,
Michael De Roover

Mail: [email protected]
Web: michael.de.roover.eu.org
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[~/Documents/tls-keys] [[email protected]]
[$] [/bin/bash] dig mx zoho.com.

; <<>> DiG 9.18.33-1~deb12u2-Debian <<>> mx zoho.com.
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 63991
;; flags: qr rd ra; QUERY: 1, ANSWER: 3, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 1232
; COOKIE: 1dbab56f239316380100000068a8452f268299236789a7fd (good)
;; QUESTION SECTION:
;zoho.com.                      IN      MX

;; ANSWER SECTION:
zoho.com.               600     IN      MX      20 smtpin2.zoho.com.
zoho.com.               600     IN      MX      10 smtpin.zoho.com.
zoho.com.               600     IN      MX      50 smtpin3.zoho.com.

;; Query time: 52 msec
;; SERVER: 192.168.15.4#53(192.168.15.4) (UDP)
;; WHEN: Fri Aug 22 12:23:43 CEST 2025
;; MSG SIZE  rcvd: 136

[0] Command completed on 2025-08-22 12:23 CEST.
--- snip ---
[~/Documents/tls-keys] [[email protected]]
[$] [/bin/bash] for mx in $(dig +short mx zoho.com. | awk '{print $2}'); do printf "[-] Domain $mx\n"; dig +short a $mx; done
[-] Domain smtpin2.zoho.com.
204.141.33.23
[-] Domain smtpin.zoho.com.
204.141.33.23
136.143.191.23
[-] Domain smtpin3.zoho.com.
136.143.191.23
[0] Command completed on 2025-08-22 12:23 CEST.
--- snip ---
[~/Documents/tls-keys] [[email protected]]
[$] [/bin/bash] for mx in $(dig +short mx zoho.com. | awk '{print $2}'); do dig +short a $mx; done
136.143.191.23
136.143.191.23
204.141.33.23
204.141.33.23
[0] Command completed on 2025-08-22 12:24 CEST.
--- snip ---
[~/Documents/tls-keys] [[email protected]]
[$] [/bin/bash] smtp_ips=$(!!)
smtp_ips=$(for mx in $(dig +short mx zoho.com. | awk '{print $2}'); do dig +short a $mx; done)
[0] Command completed on 2025-08-22 12:25 CEST.
--- snip ---
[~/Documents/tls-keys] [[email protected]]
[$] [/bin/bash] echo $smtp_ips
136.143.191.23 204.141.33.23 136.143.191.23 204.141.33.23
[0] Command completed on 2025-08-22 12:25 CEST.
--- snip ---
[~/Documents/tls-keys] [[email protected]]
[$] [/bin/bash] echo $smtp_ips | sed "s/\ /\n/g" | awk '!x[$0]++'
136.143.191.23
204.141.33.23
[0] Command completed on 2025-08-22 12:25 CEST.
--- snip ---
[~/Documents/tls-keys] [[email protected]]
[$] [/bin/bash] filtered_smtp_ips=$(!!)
filtered_smtp_ips=$(echo $smtp_ips | sed "s/\ /\n/g" | awk '!x[$0]++')
[0] Command completed on 2025-08-22 12:26 CEST.
--- snip ---
[~/Documents/tls-keys] [[email protected]]
[$] [/bin/bash] smtp_ipinfo=$(for smtp_ip in $filtered_smtp_ips; do curl https://ipinfo.io/$smtp_ip; done)
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100   284  100   284    0     0   1005      0 --:--:-- --:--:-- --:--:--  1010
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100   272  100   272    0     0   1002      0 --:--:-- --:--:-- --:--:--  1007
[0] Command completed on 2025-08-22 12:26 CEST.
--- snip ---
[~/Documents/tls-keys] [[email protected]]
[$] [/bin/bash] echo $smtp_ipinfo | jq
{
  "ip": "136.143.191.23",
  "hostname": "smtpin.zoho.com",
  "city": "Seattle",
  "region": "Washington",
  "country": "US",
  "loc": "47.6062,-122.3321",
  "org": "AS2639 ZOHO",
  "postal": "98101",
  "timezone": "America/Los_Angeles",
  "readme": "https://ipinfo.io/missingauth"
}
{
  "ip": "204.141.33.23",
  "hostname": "smtpin.zoho.com",
  "city": "Dallas",
  "region": "Texas",
  "country": "US",
  "loc": "32.7831,-96.8067",
  "org": "AS2639 ZOHO",
  "postal": "75201",
  "timezone": "America/Chicago",
  "readme": "https://ipinfo.io/missingauth"
}
[0] Command completed on 2025-08-22 12:27 CEST.
--- snip ---
[~/Documents/tls-keys] [[email protected]]
[$] [/bin/bash]

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