Funny headers and other non-standard stuff found in SMTP headers and whatnot.
https://www.shodan.io/host/37.120.179.86#25
220 mail.geekify.de Security is like an onion - the more you dig in the more you want to cry. 250-mail.geekify.de
https://www.shodan.io/host/98.110.210.76#25
220 pi.hypertouch.com ESMTP CommuniGate Pro 6.2.14. It is you again :-( 250-pi.hypertouch.com host name is unknown s9yhh2qb9k7gpp.com
https://www.shodan.io/host/194.132.234.5#25
220 fogelholk.se - Bring it! I'd love those muffins you have there! 250-fogelholk.se
https://www.shodan.io/host/45.32.128.194#25
220 thunderbowl.wente.com ESMTP laser tinted braindeath Postfix ready for love 250-thunderbowl.wente.com
https://www.shodan.io/host/96.27.204.52#25
220 mailmon.answerexcellence.com ESMTP Hi, I'm a friendly email server just looking for a love to call my own. 250-mailmon.answerexcellence.com
https://www.shodan.io/host/37.59.203.147#25
220 SMTP02.getehlo.be She says EHLO you fool I love you 250-SMTP02.getehlo.be
https://www.shodan.io/host/178.238.149.202#25
220 love.warhead.org.uk ESMTP Love is in the air... 250-love.warhead.org.uk
https://www.shodan.io/host/194.135.211.9#25
220 mx1.agat-roscosmos.ru I love this game :-) 250-mx1.agat-roscosmos.ru
https://www.shodan.io/host/94.127.66.221#25
220 mailserver at sendmail.netwh.ru greets you. Make love not war! 250-sendmail.netwh.ru
https://www.shodan.io/host/46.28.110.74#25
220 smtp.mgrivna.cz here 554 fuck shodan making money out of vulnerabilities
https://www.shodan.io/host/18.18.160.24#25
220 FUCK-THE-SKULL-OF-JESUS.MIT.EDU running Eudora Internet Mail Server 3.2.5 demo 250-FUCK-THE-SKULL-OF-JESUS.MIT.EDU hello 12h384ngjk65.com (224.124.14.242)
https://www.shodan.io/host/94.16.105.207#25
220 mail.c0r.de ESMTP Fuck off 250-mail.c0r.de
https://www.shodan.io/host/163.172.139.228#25
550 no FCrDNS so fuck off
https://www.shodan.io/host/128.199.44.47#25
220 zicar.info ESMTP Postfix (Ubuntu) - fuck you ISPs blocking smtp 250-zicar.info
https://www.shodan.io/host/23.137.249.23#25
220 mail.chaox.ro ESMTP Chaox Operations eMail. You fuck up with our mail server we'll send your IP to the Iranian govt for haram! 250-mail.chaox.ro
https://www.shodan.io/host/15.204.210.128#25
220 mx.dragynfruit.com Stalwart ESMTP at your service 250-mx.dragynfruit.com you had me at EHLO 250-STARTTLS 250-SMTPUTF8 250-SIZE 104857600 250-REQUIRETLS 250-PIPELINING 250-NO-SOLICITING GO FUCK YOURSELF
https://www.shodan.io/host/111.231.165.167#25
220 mtash.yunrelay.cn ESMTP 554 Rejected - Go fuck away you scan or attack network!
https://www.shodan.io/host/77.55.215.149#25
220 server760974.nazwa.pl ESMTP Postfix (if you're not from 0xredbeef.tech GET THE FUCK OUT!!!) 250-server760974.nazwa.pl
https://www.shodan.io/host/51.38.70.205#25
220 FUCK YOU STOP SPAMMING MY ESMTP SERVER 250-mana.ping.fr
https://www.shodan.io/host/46.175.16.239#25
220-charts.gov.ua ESMTP Mon, 10 Nov 2025 02:34:13 +0200 220-all transactions and ip addresses are recorded. 220-When you try to hack and spam, 220 the entire subnet of the provider is blocked. 250-charts.gov.ua Hello g0te4y8b2ayo.org [224.156.42.205], pleased to meet you
https://www.shodan.io/host/194.186.195.171#25
220-MUP STE SMTP server is pleased to see you. 220-Please, behave yourself! 220-You are not allowed to spam! 220-You are not allowed to crack or hack the server! 220- 220 I'm sure we'll enjoy making good work together. 250-smtp.sochi-teplo.ru Hello 224.60.6.184 [224.60.6.184]
https://www.shodan.io/host/50.251.160.28#25
220-mx.n0spam.net ESMTP Wed, 19 Nov 2025 15:36:03 -0500 220-Account login hack attempts are immediately banned. 220 Scanners and spammers are also blocked. 250-mx.n0spam.net Hello 224.60.6.184 [224.60.6.184], pleased to meet you
https://www.shodan.io/host/91.249.211.166#25
220 Hack - Spam me and you will die ! 250-mx01.plainet.de
https://www.shodan.io/host/81.90.243.184#25
220 mail.jakubschmidt.cz No Hack To My Castle 250-mail.jakubschmidt.cz
https://www.shodan.io/host/207.188.167.125#25
220-sima.cat ESMTP server ready. 220-Welcome to SIMA sl mail server 220 Do not spam, hack or try to rely and we won't blacklist you 250-sima.cat Hello 1veu1mp4fdmx.com; ESMTPs are:
https://www.shodan.io/host/103.18.55.83#25
220-mail.kcit.me ESMTP MDaemon 21.0.1; Thu, 27 Nov 2025 02:31:21 +1000 220-********************************************************************** 220-Unauthorised relay prohibited. 220-********************************************************************** 220-All transactions and IP addresses are logged for security reasons. 220-********************************************************************** 220-If your email server has been blacklisted please contact 220-your mail provider or IT department for assistance. 220 ********************************************************************** 250-mail.kcit.me Hello lodnovxsrv010.org [224.226.160.33], pleased to meet you