Wombatmail, now with spam traps + more

It's time for a Wombat Update! I've got new data snapshots to share over on Wombatmail. In the new Wombatmail Traps section, you'll find a list of the top /24 network ranges that have sent email messages through my spam trap network recently. Click on a netblock and you'll get a break down of IP addresses in that block that have sent mail to spam trap addresses recently.

This is not meant to be live feedback to help with list cleaning. It's a snapshot that I'll update approximately monthly, and it is all output as static pages, making it easy for folks doing reputation research on different networks or IP addresses to stumble across this data using their favorite search engine. I've also sanitized the volume data to not give exact numbers, meant to keep folks from trying to manipulate results by correlating traffic exact traffic counts to a specific IP. Meaning this data won't be very useful for list washing or spam trap hunting.

If you have any interest in getting a feed of my spam trap data, contact me to discuss. (Note that this is only a partial snapshot of my spam trap data; right now I'm capturing this summary data using information from only one of my round-robin spam trap inbound mail servers.)

Besides the new Wombatmail Traps section, I've updated one of the core DNS lookup tools: Wombatmail DNI (DomaiN Intelligence). This is a tool that I originally built way back in 2015 to help email industry colleagues pull together multiple data points for an email domain, all on one screen, to quickly make a best guess as to whether or not the domain is valid to receive inbound mail. Since then I haven't done much updating, but it seems to get a fair amount of traffic, and I was occasionally receiving bug reports from folks actively using the tool to check the validity of various email domains.

To decide how to update this tool, I made two lists, side by side:

  • What data points we were looking at back in 2015 to identify if an email domain is valid or not, and
  • What data points we look at it 2024 to identify if an email domain is valid or not.

I kept checks in place if they appeared on both lists, removed what no longer makes sense to check in 2024, added a few new checks, and corrected bugs along the way. Keep in mind that this isn't a substitute for an email validation tool -- we're not connecting to anybody's mail servers, nor checking to see if specific addresses are responding via SMTP -- and while it might recognize a bad MX record or two, it's never going to reliably catch spam trap addresses. But if you need to do a quick check to see, if, based on a bunch of passive checks, if the given domain is one that should accept your inbound mail, you might find this tool useful. Check it out here, and I'd love to hear your feedback.

Bonus: Remember Wombatlink? It's a short link redirect tool that I first implemented back many years ago. It's back! Find it on the Wombatmail Tools page.

And don't forget, the Wombatmail Data section breaks down common mailbox providers for a large snapshot of the top ten million domains. Useful when you're trying to get a feel for how many email domains are hosted by or protected by a given mailbox provider or email security service. Fun fact: Did you know that Gandi.net hosts email server for just over 18,000 of the top ten million domains?

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