#spamd — Public Fediverse posts

Returning readers will remember my "Eighteen years of greytrapping" piece (https://nxdomain.no/~peter/eighteen_years_of_greytrapping.html or tracked https://bsdly.blogspot.com/2025/08/eighteen-years-of-greytrapping-is.html, and may also remember that it has numbers and graphs.

It's now been more like 19 years of the activity, and the numbers and graphs are refreshed as of end of July.

#spam #antispam #spamd #openbsd #greylisting #greytrapping #security #cybercrime #cybersecurity #smtp #email

Returning readers will remember my "Eighteen years of greytrapping" piece (https://nxdomain.no/~peter/eighteen_years_of_greytrapping.html or tracked https://bsdly.blogspot.com/2025/08/eighteen-years-of-greytrapping-is.html, and may also remember that it has numbers and graphs.

It's now been more like 19 years of the activity, and the numbers and graphs are refreshed as of end of July.

#spam #antispam #spamd #openbsd #greylisting #greytrapping #security #cybercrime #cybersecurity #smtp #email

When the list of trapped hosts swells like it has over the last day, I wonder why.

Now I know. I thought #wankstortion was dead, but one inboxed for the -owner address for a mailing list.

General description in my 2022 piece "The Despicable, No Good, Blackmail Campaign Targeting ... Imaginary Friends?" https://nxdomain.no/~peter/despicable_no_good_blackmail.html with links to preserved messages therein.
#cybercrime #security #scams #sextortion #imaginaryfriends #spamd #greytrapping

When the list of trapped hosts swells like it has over the last day, I wonder why.

Now I know. I thought #wankstortion was dead, but one inboxed for the -owner address for a mailing list.

General description in my 2022 piece "The Despicable, No Good, Blackmail Campaign Targeting ... Imaginary Friends?" https://nxdomain.no/~peter/despicable_no_good_blackmail.html with links to preserved messages therein.
#cybercrime #security #scams #sextortion #imaginaryfriends #spamd #greytrapping

hm. this thing seems to be popping up again and again https://news.ycombinator.com/item?id=47636937 #greytrapping #email #runyourownmailserver #spam #spamd #greylisting #antispam

hm. this thing seems to be popping up again and again https://news.ycombinator.com/item?id=47636937 #greytrapping #email #runyourownmailserver #spam #spamd #greylisting #antispam

Running #OpenBSD 7.8 ​:openbsd:​

DNS: #nsd (3 Master Zones), #DNSSEC & #DANE (RFC6698) + #unbound
Firewall: #pf with auto-fed tables (IPS-style), spambot-tarpitting & service rate limits.
Mail: #smtpd (Multi-domain, RFC8461/MTA-STS) + #rspamd (DKIM) + #dovecot (IMAPS-only).
Spam-Defense: #spamd with auto-SPF-walk (no more greylisting issues).
Web: #relayd (TLS-Terminator, HSTS, CSP) + #httpd (NIP-05, Autoconfig, security.txt).
Performance: Lightweight "Fail2Ban" via 1-liner shell script (No Python crap!).

#Nostr Relay in Rust building...

#SelfHosted #SysAdmin #Security #Privacy

Running #OpenBSD 7.8 ​:openbsd:​

DNS: #nsd (3 Master Zones), #DNSSEC & #DANE (RFC6698) + #unbound
Firewall: #pf with auto-fed tables (IPS-style), spambot-tarpitting & service rate limits.
Mail: #smtpd (Multi-domain, RFC8461/MTA-STS) + #rspamd (DKIM) + #dovecot (IMAPS-only).
Spam-Defense: #spamd with auto-SPF-walk (no more greylisting issues).
Web: #relayd (TLS-Terminator, HSTS, CSP) + #httpd (NIP-05, Autoconfig, security.txt).
Performance: Lightweight "Fail2Ban" via 1-liner shell script (No Python crap!).

#Nostr Relay in Rust building...

#SelfHosted #SysAdmin #Security #Privacy

Friends, is this https://nxdomain.no/~peter/20260224_smtp_blast_to_imaginary_friends.txt what a successful campaign looks like?

(also see https://nxdomain.no/~peter/eighteen_years_of_greytrapping.html or for that matter https://nostarch.com/book-of-pf-4e) @nostarch #greyptrapping #spam #spamd #pf #packetfilter #greylisting #email #cybercrime #marketing #scams

Friends, is this https://nxdomain.no/~peter/20260224_smtp_blast_to_imaginary_friends.txt what a successful campaign looks like?

(also see https://nxdomain.no/~peter/eighteen_years_of_greytrapping.html or for that matter https://nostarch.com/book-of-pf-4e) @nostarch #greyptrapping #spam #spamd #pf #packetfilter #greylisting #email #cybercrime #marketing #scams

I added a few more translations of the phrase "The rest is trash" to the spamtraps at https://nxdomain.no/~peter/traplist.shtml (see https://nxdomain.no/~peter/the_rest_is_trash.html or https://bsdly.blogspot.com/2026/02/the-rest-is-trash.html).

If you want further translations added, please let me know (with translation in your message).

#spamtraps #greytrapping #spamd #openbsd #freebsd #antispam #imaginaryfriends #localization #cybercrime

The list without wrapper text is available as https://www.bsdly.net/~peter/sortlist.txt (BIG! -- 22975800 entries as of right now, will increase)

I added a few more translations of the phrase "The rest is trash" to the spamtraps at https://nxdomain.no/~peter/traplist.shtml (see https://nxdomain.no/~peter/the_rest_is_trash.html or https://bsdly.blogspot.com/2026/02/the-rest-is-trash.html).

If you want further translations added, please let me know (with translation in your message).

#spamtraps #greytrapping #spamd #openbsd #freebsd #antispam #imaginaryfriends #localization #cybercrime

The list without wrapper text is available as https://www.bsdly.net/~peter/sortlist.txt (BIG! -- 22975800 entries as of right now, will increase)

"The Rest Is Trash"

We are now halfway through the nineteenth year of greytrapping, still tracking and collecting from the wealth of imbecility out there

https://nxdomain.no/~peter/the_rest_is_trash.html (tracked https://bsdly.blogspot.com/2026/02/the-rest-is-trash.html) #spamd #greytrapping #greylisting #openbsd #freebsd #spam #antispam #cybercrime

"The Rest Is Trash"

We are now halfway through the nineteenth year of greytrapping, still tracking and collecting from the wealth of imbecility out there

https://nxdomain.no/~peter/the_rest_is_trash.html (tracked https://bsdly.blogspot.com/2026/02/the-rest-is-trash.html) #spamd #greytrapping #greylisting #openbsd #freebsd #spam #antispam #cybercrime

Reprising my Sunday, Feb 1st post for the midweek crowd:

The Rest Is Trash https://nxdomain.no/~peter/the_rest_is_trash.html (tracked https://bsdly.blogspot.com/2026/02/the-rest-is-trash.html) following up on #greytrapping, updating the 18 years piece https://nxdomain.no/~peter/eighteen_years_of_greytrapping.html #openbsd #spamd #greytrappng #greylisting #antispam #cybercrime #networking #spam

Reprising my Sunday, Feb 1st post for the midweek crowd:

The Rest Is Trash https://nxdomain.no/~peter/the_rest_is_trash.html (tracked https://bsdly.blogspot.com/2026/02/the-rest-is-trash.html) following up on #greytrapping, updating the 18 years piece https://nxdomain.no/~peter/eighteen_years_of_greytrapping.html #openbsd #spamd #greytrappng #greylisting #antispam #cybercrime #networking #spam

The latest "Lazy reading" by Dragonfly Digest @dragonflydigest https://www.dragonflydigest.com/ has "Eighteen years of Greytrapping" https://nxdomain.no/~peter/eighteen_years_of_greytrapping.html featured. Later this year it will be nineteen years :) (and updates will come) #spamd #spam #openbsd #antispam #greytrapping #greylisting #cybercrime

The latest "Lazy reading" by Dragonfly Digest @dragonflydigest https://www.dragonflydigest.com/ has "Eighteen years of Greytrapping" https://nxdomain.no/~peter/eighteen_years_of_greytrapping.html featured. Later this year it will be nineteen years :) (and updates will come) #spamd #spam #openbsd #antispam #greytrapping #greylisting #cybercrime

Heh. Looks like the tracked version of Why 451 is Good for You - Greylisting Perspectives From the Early Noughties https://nxdomain.no/~peter/why_451_is_good.html (tracked https://bsdly.blogspot.com/2025/12/why-451-is-good-for-you-greylisting.html) hit hackernews: https://news.ycombinator.com/item?id=46414653

No, I willl not respond to those comments either :D

#greylisting #greytrapping #spam #spamtrapping #antispam #spamd #openbsd #smtp

Heh. Looks like the tracked version of Why 451 is Good for You - Greylisting Perspectives From the Early Noughties https://nxdomain.no/~peter/why_451_is_good.html (tracked https://bsdly.blogspot.com/2025/12/why-451-is-good-for-you-greylisting.html) hit hackernews: https://news.ycombinator.com/item?id=46414653

No, I willl not respond to those comments either :D

#greylisting #greytrapping #spam #spamtrapping #antispam #spamd #openbsd #smtp

The update you have been waiting for:

"Eighteen Years of Greytrapping - Is the Weirdness Finally Paying Off?" https://nxdomain.no/~peter/eighteen_years_of_greytrapping.html (tracked https://bsdly.blogspot.com/2025/08/eighteen-years-of-greytrapping-is.html)

now has the complete 2025 data in place. #openbsd #spamd #greytrapping #spam #antispam #cybercrime #spamtraps #blocklists

The update you have been waiting for:

"Eighteen Years of Greytrapping - Is the Weirdness Finally Paying Off?" https://nxdomain.no/~peter/eighteen_years_of_greytrapping.html (tracked https://bsdly.blogspot.com/2025/08/eighteen-years-of-greytrapping-is.html)

now has the complete 2025 data in place. #openbsd #spamd #greytrapping #spam #antispam #cybercrime #spamtraps #blocklists

Possibly not blogworthy, but: One puzzling side effect of running greytrapping (as chronicled in https://nxdomain.no/~peter/eighteen_years_of_greytrapping.html) is seeing the uptick in password guessing using even the obviously generated gibberish local parts, and the sheer volume of tries (see https://nxdomain.no/~peter/should_i_stop_caring_and_let_ip_reputation_sort_them_out.html and links therein). #greytrapping #passwordguessing #passwordgroping #spamd #ssh #pop3gropers

Possibly not blogworthy, but: One puzzling side effect of running greytrapping (as chronicled in https://nxdomain.no/~peter/eighteen_years_of_greytrapping.html) is seeing the uptick in password guessing using even the obviously generated gibberish local parts, and the sheer volume of tries (see https://nxdomain.no/~peter/should_i_stop_caring_and_let_ip_reputation_sort_them_out.html and links therein). #greytrapping #passwordguessing #passwordgroping #spamd #ssh #pop3gropers

Hm. log entries like

Sep 30 00:54:41 skapet spamd[83364]: (GREY) 171.4.7.241: <[email protected]> -> <[email protected]>
Sep 30 00:54:41 skapet spamd[83004]: new entry 171.4.7.241 from <[email protected]> to <[email protected]>, helo ns3000605.ip-37-59-46.eu

have me suspect they are actually reading my stuff such as https://nxdomain.no/~peter/eighteen_years_of_greytrapping.html #spamtraps #greytrapping #antispam #cybercrime #spamd #openbsd

Hm. log entries like

Sep 30 00:54:41 skapet spamd[83364]: (GREY) 171.4.7.241: <[email protected]> -> <[email protected]>
Sep 30 00:54:41 skapet spamd[83004]: new entry 171.4.7.241 from <[email protected]> to <[email protected]>, helo ns3000605.ip-37-59-46.eu

have me suspect they are actually reading my stuff such as https://nxdomain.no/~peter/eighteen_years_of_greytrapping.html #spamtraps #greytrapping #antispam #cybercrime #spamd #openbsd

And yes of course, that became a fresh spamtrap, number 8205067 or thereabouts. see the old favorite https://nxdomain.no/~peter/eighteen_years_of_greytrapping.html #greytrapping #openbsd #spamd #cybercrime

And yes of course, that became a fresh spamtrap, number 8205067 or thereabouts. see the old favorite https://nxdomain.no/~peter/eighteen_years_of_greytrapping.html #greytrapping #openbsd #spamd #cybercrime

Now 8024921 imaginary friends (and counting), at https://nxdomain.no/~peter/traplist.shtml, mainly exhumed from logs.

For the bored but not restless, https://nxdomain.no/~peter/eighteen_years_of_greytrapping.html (also https://bsdly.blogspot.com/2025/08/eighteen-years-of-greytrapping-is.html) #greytrapping #spamtraps #spamd #openbsd #spam #cybercrime

Now 8024921 imaginary friends (and counting), at https://nxdomain.no/~peter/traplist.shtml, mainly exhumed from logs.

For the bored but not restless, https://nxdomain.no/~peter/eighteen_years_of_greytrapping.html (also https://bsdly.blogspot.com/2025/08/eighteen-years-of-greytrapping-is.html) #greytrapping #spamtraps #spamd #openbsd #spam #cybercrime

glancing at the #spamd log I see attempts like

Sep 15 14:53:06 skapet spamd[85002]: (GREY) 103.120.44.85: <[email protected]> -> <[email protected]>
Sep 15 14:53:06 skapet spamd[70382]: Trapping 103.120.44.85 for tuple 103.120.44.85 [103.120.44.85] <[email protected]> <[email protected]>

I suspect another #wankstortion campaign but won't know for sure until something actually inboxes (unlikely) or enough shows up in the log itself. In the meantime, https://www.nxdomain.no/~peter/despicable_no_good_blackmail.html

glancing at the #spamd log I see attempts like

Sep 15 14:53:06 skapet spamd[85002]: (GREY) 103.120.44.85: <[email protected]> -> <[email protected]>
Sep 15 14:53:06 skapet spamd[70382]: Trapping 103.120.44.85 for tuple 103.120.44.85 [103.120.44.85] <[email protected]> <[email protected]>

I suspect another #wankstortion campaign but won't know for sure until something actually inboxes (unlikely) or enough shows up in the log itself. In the meantime, https://www.nxdomain.no/~peter/despicable_no_good_blackmail.html

heh. with another 70 weeks of log data to sift through, the count of imaginary friends at https://nxdomain.no/~peter/traplist.shtml just rolled past seven million (also see https://nxdomain.no/~peter/eighteen_years_of_greytrapping.html or tracked https://bsdly.blogspot.com/2025/08/eighteen-years-of-greytrapping-is.html) #spamtraps #imaginaryfriends #spamd #smtp #cybercrime #openbsd

heh. with another 70 weeks of log data to sift through, the count of imaginary friends at https://nxdomain.no/~peter/traplist.shtml just rolled past seven million (also see https://nxdomain.no/~peter/eighteen_years_of_greytrapping.html or tracked https://bsdly.blogspot.com/2025/08/eighteen-years-of-greytrapping-is.html) #spamtraps #imaginaryfriends #spamd #smtp #cybercrime #openbsd

Have you been wondering why the list of imaginary friends at https://nxdomain.no/~peter/traplist.shtml has been expanding quicker than usual this week?

It's because I found another batch of old logs that are now getting the more thorough treatment (also see https://nxdomain.no/~peter/eighteen_years_of_greytrapping.html or tracked https://bsdly.blogspot.com/2025/08/eighteen-years-of-greytrapping-is.html) #spamd #greytrapping #spam #cybercrime #openbsd

Have you been wondering why the list of imaginary friends at https://nxdomain.no/~peter/traplist.shtml has been expanding quicker than usual this week?

It's because I found another batch of old logs that are now getting the more thorough treatment (also see https://nxdomain.no/~peter/eighteen_years_of_greytrapping.html or tracked https://bsdly.blogspot.com/2025/08/eighteen-years-of-greytrapping-is.html) #spamd #greytrapping #spam #cybercrime #openbsd

Oh, the number of bsdly imaginary friends just rolled past 6 million, https://nxdomain.no/~peter/traplist.shtml (background https://nxdomain.no/~peter/eighteen_years_of_greytrapping.html or tracked https://bsdly.blogspot.com/2025/08/eighteen-years-of-greytrapping-is.html), may update graphs at month end #openbsd #spamd #greytrapping #antispam #cybercrime #nastykidsister

Oh, the number of bsdly imaginary friends just rolled past 6 million, https://nxdomain.no/~peter/traplist.shtml (background https://nxdomain.no/~peter/eighteen_years_of_greytrapping.html or tracked https://bsdly.blogspot.com/2025/08/eighteen-years-of-greytrapping-is.html), may update graphs at month end #openbsd #spamd #greytrapping #antispam #cybercrime #nastykidsister

Hm. It looks like my publishing the "Eighteen years of greytrapping ..." retrospective https://nxdomain.no/~peter/eighteen_years_of_greytrapping.html (https://bsdly.blogspot.com/2025/08/eighteen-years-of-greytrapping-is.html) has generated an uptick in digital archaeology. People are fetching the archived lists at a surprising rate. #greytrapping #spamd #openbsd #pf #packetfiltering #antispam #cybercrime #security

Hm. It looks like my publishing the "Eighteen years of greytrapping ..." retrospective https://nxdomain.no/~peter/eighteen_years_of_greytrapping.html (https://bsdly.blogspot.com/2025/08/eighteen-years-of-greytrapping-is.html) has generated an uptick in digital archaeology. People are fetching the archived lists at a surprising rate. #greytrapping #spamd #openbsd #pf #packetfiltering #antispam #cybercrime #security

Hey! My "Eighteen Years of Greytrapping - Is the Weirdness Finally Paying Off?" https://bsdly.blogspot.com/2025/08/eighteen-years-of-greytrapping-is.html (https://nxdomain.no/~peter/eighteen_years_of_greytrapping.html) is on @vermaden's Valuable news https://vermaden.wordpress.com/2025/08/18/valuable-news-2025-08-18/ #openbsd #spamd #greytrapping #freebsd #valueablenews @nostarch

Hey! My "Eighteen Years of Greytrapping - Is the Weirdness Finally Paying Off?" https://bsdly.blogspot.com/2025/08/eighteen-years-of-greytrapping-is.html (https://nxdomain.no/~peter/eighteen_years_of_greytrapping.html) is on @vermaden's Valuable news https://vermaden.wordpress.com/2025/08/18/valuable-news-2025-08-18/ #openbsd #spamd #greytrapping #freebsd #valueablenews @nostarch

Aug 17 09:38:58 skapet spamd[36107]: (GREY) 141.98.10.53: <[email protected]> -> <[email protected]>
Aug 17 09:38:58 skapet spamd[30363]: Trapping 141.98.10.53 for tuple 141.98.10.53 host-141-98-10-.domain <[email protected]> <[email protected]>
Aug 17 09:38:58 skapet spamd[30363]: new greytrap entry 141.98.10.53 from <[email protected]> to <[email protected]>, helo host-141-98-10-.domain

Yes, #greytrapping https://nxdomain.no/~peter/eighteen_years_of_greytrapping.html #spamd #spam #cybercrime #openbsd #mail #security

Aug 17 09:38:58 skapet spamd[36107]: (GREY) 141.98.10.53: <[email protected]> -> <[email protected]>
Aug 17 09:38:58 skapet spamd[30363]: Trapping 141.98.10.53 for tuple 141.98.10.53 host-141-98-10-.domain <[email protected]> <[email protected]>
Aug 17 09:38:58 skapet spamd[30363]: new greytrap entry 141.98.10.53 from <[email protected]> to <[email protected]>, helo host-141-98-10-.domain

Yes, #greytrapping https://nxdomain.no/~peter/eighteen_years_of_greytrapping.html #spamd #spam #cybercrime #openbsd #mail #security

Eighteen Years of Greytrapping Retrospective Published https://www.undeadly.org/cgi?action=article;sid=20250812064257 #openbsd #spamd #greytrapping #antispam #security #cybercrime #spamtraps

Eighteen Years of Greytrapping Retrospective Published https://www.undeadly.org/cgi?action=article;sid=20250812064257 #openbsd #spamd #greytrapping #antispam #security #cybercrime #spamtraps

In 2013 I wrote up "Maintaining A Publicly Available Blacklist - Mechanisms And Principles" (also https://bsdly.blogspot.com/2013/04/maintaining-publicly-available.html) . TL;DR: blocklisting is a kind of public shaming, be sure your process is verifiable and transparent.

Minor edits today, links to resources and #eurobsdcon inside. #blocklists #spamtraps #antispam #smtp #spamd #openbsd #freebsd #security #cybercrime

In 2013 I wrote up "Maintaining A Publicly Available Blacklist - Mechanisms And Principles" (also https://bsdly.blogspot.com/2013/04/maintaining-publicly-available.html) . TL;DR: blocklisting is a kind of public shaming, be sure your process is verifiable and transparent.

Minor edits today, links to resources and #eurobsdcon inside. #blocklists #spamtraps #antispam #smtp #spamd #openbsd #freebsd #security #cybercrime

Following up on previous, the LinkedIn discussion revealed that there are people who have not heard about greylisting.

So here is my 2012 piece with updates, "In The Name Of Sane Email: Setting Up OpenBSD's spamd(8) With Secondary MXes In Play - A Full Recipe" https://nxdomain.no/~peter/in_the_name_of_sane_email.html

#spamd #antispam #spamd.conf #OpenBSD #blocklists #blacklists #greytrapping #greylisting #spam

Following up on previous, the LinkedIn discussion revealed that there are people who have not heard about greylisting.

So here is my 2012 piece with updates, "In The Name Of Sane Email: Setting Up OpenBSD's spamd(8) With Secondary MXes In Play - A Full Recipe" https://nxdomain.no/~peter/in_the_name_of_sane_email.html

#spamd #antispam #spamd.conf #OpenBSD #blocklists #blacklists #greytrapping #greylisting #spam

"Oh yes, you signed up for this. You did. Honest." https://nxdomain.no/~peter/oh_yes_you_signed_up_for_this_2009.html A linkedin post (linked within) reminded me of this post (from 2009), now added here, almost pristine
#greytrapping #spam #countermeasures #email #scams #spamd #wellpoisoning #cybercrime #counterprank

"Oh yes, you signed up for this. You did. Honest." https://nxdomain.no/~peter/oh_yes_you_signed_up_for_this_2009.html A linkedin post (linked within) reminded me of this post (from 2009), now added here, almost pristine
#greytrapping #spam #countermeasures #email #scams #spamd #wellpoisoning #cybercrime #counterprank

September 7, 2022 the 300,000th spamtrap was added to our list of imaginary friends, see "The Things Spammers Believe - A Tale of 300,000 Imaginary Friends" https://nxdomain.no/~peter/spammers_believe_in_300k_imaginary_friends.html.

Today, the number at at https://nxdomain.no/~peter/traplist.shtml rolled past 5,000,000 (yes, five million). #spam #spamtraps #spamd #openbsd #cybercrime #scams #malware

September 7, 2022 the 300,000th spamtrap was added to our list of imaginary friends, see "The Things Spammers Believe - A Tale of 300,000 Imaginary Friends" https://nxdomain.no/~peter/spammers_believe_in_300k_imaginary_friends.html.

Today, the number at at https://nxdomain.no/~peter/traplist.shtml rolled past 5,000,000 (yes, five million). #spam #spamtraps #spamd #openbsd #cybercrime #scams #malware

The symptoms of what I take to have been a #phishing campaign aimed at users in #japan are no longer that visible in the backscatter.

But they will be visible as new #imaginaryfriends in the published #spamtraps list we user for our our #openbsd #spamd #graytrapping, see https://nxdomain.no/~peter/traplist.shtml and https://nxdomain.no/~peter/spammers_believe_in_300k_imaginary_friends.html (with the total now inching in the direction of the 5 million mark)

The symptoms of what I take to have been a #phishing campaign aimed at users in #japan are no longer that visible in the backscatter.

But they will be visible as new #imaginaryfriends in the published #spamtraps list we user for our our #openbsd #spamd #graytrapping, see https://nxdomain.no/~peter/traplist.shtml and https://nxdomain.no/~peter/spammers_believe_in_300k_imaginary_friends.html (with the total now inching in the direction of the 5 million mark)

I interpret the following

Apr 20 18:38:09 skapet spamd[52874]: (GREY) 117.53.153.22: <> -> <[email protected]>

As a sign there are still, er, individuals out there who think SMTP callbacks were a good idea.

Please have them read "Twenty-plus years on, SMTP callbacks are still pointless and need to die" (2017) https://nxdomain.no/~peter/twenty-plus_years_on_smtp_callbacks_are_still_pointless.html

#spam #spamd #smtp #callbacks #email #mail #antispam #cybercrime #shitheads #imbeciles #incompetence

I interpret the following

Apr 20 18:38:09 skapet spamd[52874]: (GREY) 117.53.153.22: <> -> <[email protected]>

As a sign there are still, er, individuals out there who think SMTP callbacks were a good idea.

Please have them read "Twenty-plus years on, SMTP callbacks are still pointless and need to die" (2017) https://nxdomain.no/~peter/twenty-plus_years_on_smtp_callbacks_are_still_pointless.html

#spam #spamd #smtp #callbacks #email #mail #antispam #cybercrime #shitheads #imbeciles #incompetence