Spam Resource: All Things Deliverability

If you're going to use your domain (or a custom domain) with an email platform, try, if at all possible, to use your main domain name. Here's why I say that. Let's pretend I'm a large multi-national corporation called Al Iverson. I own aliverson.com. Nobody e…

Another anti-spam blacklist has ceased to exist. For more on the now-defunct Email Basura blacklist, head over to DNSBL Resource .

I've updated the XNND DNS lookup tool so that it you can now select "Multi DNS = yes" and the tool will now make the same DNS query against a number of different public DNS servers all in a row. It'll help you catch issues where you've perhaps updated a …

Gossip has been flowing through the back channels lately suggesting that Microsoft might be checking Sender ID email authentication DNS records anew. No...but. My answer to this is a little nuanced, so bear with me. Not true: "Sender ID never really died, they're s…

It appears that the email domain ono.com is going away. ONO was a Spanish broadband communication and entertainment company, purchased by Vodafone in 2014. Fast forward to 2019, and it looks like Vodafone is shutting down the ono.com email domain. Vodafone has published a page …

Email Compliance manager Skyler Holobach explains why you shouldn't act on clickbait advice you find on the internet.  Read more >>

I'm pulling together information from various sources here, and using a bit of guesswork. So keep in mind that this info is not guaranteed. When sending mail to Charter/TWC/RoadRunner domains ( full list here ), are you seeing any of these bounces? 550 5.1.0 sender reje…

This is pretty basic stuff; it's not inaccurate, but it's not complete. Most other ISPs have other things going on that can also result in emails going to the spam folder. But as a starting point? It's not too bad. Check it out, from NBC: How Email Spam Filters Work…

Wondering what different kind of bounces an ISP might give to you? Postmark put together this handy-dandy SMTP bounce example lookup tool. It's called the SMTP Field Manual  and it's pretty neat.

Speaking of Spamhaus, this just popped up in my RSS feed reader. It looks like Spamhaus is going to take a harder stance against users who query their lists via open or public DNS systems (such as Google Public DNS or Cloudflare's 1.1.1.1 Service). They're going to r…