In case you are wondering why we are calling out a 3rd party service, it’s because it’s broken, and even if I contact the mail administrator they have architectural problems with their service which won’t get fixed because it was never designed properly.
As we always say in email, it takes two to tango. When one of my 1000s of users who have independent domains call me, and tell me email is failing, I always do a deep dive.
In the case of “mailspamprotection.com” is pretty fucking trivial. Their aggressive SMTP server IP rotation fucks out on greylisting. As a consequence their poor noob users, instead of being protected, suffer from delivery problems.
As digital proof, here is the log file:
Hello 185.56.87.11? Hello 185.56.87.9? Oh wait, hello 185.56.87.10
Team developers – go and look it up – greylisting is one of the most common spam fighting techniques and you don’t have the cloud of Microsoft or Google so not every company is going to white list you. Rather fix your architecture and make your clients happy again.
2026-02-02 08:17:52 server postfix/smtpd[3049584]: connect from delivery.antispam.mailspamprotection.com[185.56.87.11] 2026-02-02 08:17:52 server postfix/smtpd[3049584]: lost connection after CONNECT from delivery.antispam.mailspamprotection.com[185.56.87.11] 2026-02-02 08:17:52 server postfix/smtpd[3049584]: disconnect from delivery.antispam.mailspamprotection.com[185.56.87.11] commands=0/0 2026-02-02 08:44:07 server postfix/smtpd[3081386]: connect from delivery.antispam.mailspamprotection.com[185.56.87.9] 2026-02-02 08:44:07 server postfix/smtpd[3081386]: lost connection after CONNECT from delivery.antispam.mailspamprotection.com[185.56.87.9] 2026-02-02 08:44:07 server postfix/smtpd[3081386]: disconnect from delivery.antispam.mailspamprotection.com[185.56.87.9] commands=0/0 2026-02-02 08:48:57 server postfix/smtpd[3054234]: connect from delivery.antispam.mailspamprotection.com[185.56.87.10] 2026-02-02 08:48:57 server postfix/smtpd[3054234]: lost connection after CONNECT from delivery.antispam.mailspamprotection.com[185.56.87.10] 2026-02-02 08:48:57 server postfix/smtpd[3054234]: disconnect from delivery.antispam.mailspamprotection.com[185.56.87.10] commands=0/0 2026-02-02 10:23:57 server postfix/smtpd[3145946]: connect from delivery.antispam.mailspamprotection.com[185.56.87.12] 2026-02-02 10:23:57 server postfix/smtpd[3145946]: lost connection after CONNECT from delivery.antispam.mailspamprotection.com[185.56.87.12] 2026-02-02 10:23:57 server postfix/smtpd[3145946]: disconnect from delivery.antispam.mailspamprotection.com[185.56.87.12] commands=0/0 2026-02-02 10:38:01 server postfix/smtpd[3145954]: connect from delivery.antispam.mailspamprotection.com[185.56.87.11] 2026-02-02 10:38:01 server postfix/smtpd[3145954]: lost connection after CONNECT from delivery.antispam.mailspamprotection.com[185.56.87.11] 2026-02-02 10:38:01 server postfix/smtpd[3145954]: disconnect from delivery.antispam.mailspamprotection.com[185.56.87.11] commands=0/0 2026-02-02 10:47:22 server postfix/smtpd[3145954]: connect from delivery.antispam.mailspamprotection.com[185.56.87.0] 2026-02-02 10:47:22 server postfix/smtpd[3145954]: lost connection after CONNECT from delivery.antispam.mailspamprotection.com[185.56.87.0] 2026-02-02 10:47:22 server postfix/smtpd[3145954]: disconnect from delivery.antispam.mailspamprotection.com[185.56.87.0] commands=0/0 2026-02-02 11:02:13 server postfix/smtpd[3179843]: connect from delivery.antispam.mailspamprotection.com[185.56.87.13] 2026-02-02 11:02:13 server postfix/smtpd[3179843]: lost connection after CONNECT from delivery.antispam.mailspamprotection.com[185.56.87.13] 2026-02-02 11:02:13 server postfix/smtpd[3179843]: disconnect from delivery.antispam.mailspamprotection.com[185.56.87.13] commands=0/0 2026-02-02 11:07:22 server postfix/smtpd[3147280]: connect from delivery.antispam.mailspamprotection.com[185.56.87.13] 2026-02-02 11:07:22 server postfix/smtpd[3147280]: lost connection after CONNECT from delivery.antispam.mailspamprotection.com[185.56.87.13] 2026-02-02 11:07:22 server postfix/smtpd[3147280]: disconnect from delivery.antispam.mailspamprotection.com[185.56.87.13] commands=0/0 2026-02-02 11:56:36 server postfix/smtpd[3213140]: connect from delivery.antispam.mailspamprotection.com[185.56.87.9] 2026-02-02 11:56:36 server postfix/smtpd[3213140]: lost connection after CONNECT from delivery.antispam.mailspamprotection.com[185.56.87.9] 2026-02-02 11:56:36 server postfix/smtpd[3213140]: disconnect from delivery.antispam.mailspamprotection.com[185.56.87.9] commands=0/0 2026-02-02 12:01:26 server postfix/smtpd[3210036]: connect from delivery.antispam.mailspamprotection.com[185.56.87.12] 2026-02-02 12:01:26 server postfix/smtpd[3210036]: lost connection after CONNECT from delivery.antispam.mailspamprotection.com[185.56.87.12] 2026-02-02 12:01:26 server postfix/smtpd[3210036]: disconnect from delivery.antispam.mailspamprotection.com[185.56.87.12] commands=0/0 2026-02-04 16:02:13 server postfix/smtp[1358570]: 946B818775A: to=<[email protected]>, relay=mx10.antispam.mailspamprotection.com[34.149.79.66]:25, delay=30, delays=6.3/0/5.6/18, dsn=2.0.0, status=sent (250 OK id=1vndSB-000000058or-2cxP) 2026-02-04 16:50:34 server postfix/smtp[1401718]: 3F6AB18376E: to=<[email protected]>, relay=mx10.antispam.mailspamprotection.com[34.149.79.66]:25, delay=17, delays=0.29/0/5.5/11, dsn=2.0.0, status=sent (250 OK id=1vneD4-00000006Y9t-2wBy) 2026-02-04 16:58:14 server postfix/smtpd[1404299]: connect from delivery.antispam.mailspamprotection.com[185.56.86.128] 2026-02-04 16:58:14 server postfix/smtpd[1404299]: lost connection after CONNECT from delivery.antispam.mailspamprotection.com[185.56.86.128] 2026-02-04 16:58:14 server postfix/smtpd[1404299]: disconnect from delivery.antispam.mailspamprotection.com[185.56.86.128] commands=0/0 2026-02-04 17:04:16 server postfix/smtpd[1377198]: connect from delivery.antispam.mailspamprotection.com[185.56.86.139] 2026-02-04 17:04:16 server postfix/smtpd[1377198]: lost connection after CONNECT from delivery.antispam.mailspamprotection.com[185.56.86.139] 2026-02-04 17:04:16 server postfix/smtpd[1377198]: disconnect from delivery.antispam.mailspamprotection.com[185.56.86.139] commands=0/0
Disagree? I’m happy to explain this in person, call my personal mobile on +27 82 309-6710 or email me at eugene (at) vander.host and we can do a quick email workshop, me on the terminal, and you hopefully too.