Spam Resource: All Things Deliverability

I've talked about unsubscribe practices in more detail before, but I think it's important enough to call this one out on its own. If your email send platform, CRM, or newsletter tool, includes a "one click unsub" link, you're going to end up with false po…

Spoiler: It's when Icelandic horses respond to your work emails for you. The blog Government Technology explains in more detail .

Validity manages ISP feedback loops for a whole bunch of ISPs (30+) all around the world. They've got a signup and management interface for this "Universal Feedback Loop Service" at fbl.validity.com . And they have just announced that they've added SFR and G…

"Is this message transactional, or is it commercial?" That's a question I get asked quite regularly as a deliverability consultant. Note that I am not a lawyer, so I can't give you legal advice. I can, however, provide my layman's interpretation and encou…

BIMI's so hot right now! Everybody's asking me lately which ISPs support it and how do I set it up and do I need a VMC and more! Lots of smart folks have implemented a BIMI logo already -- and I think BIMI adoption is poised to explode...maybe making this the summer of …

Also called blocking lists, blocklists are lists of IP addresses and/or domain names that are used as data to feed into various email servers and spam filters. The implication is typically that by inclusion of a particular IP address or domain name on that blocklist, that the p…

Jeff Butts from Mac Observer walks you through how to send an email using Apple's "Hide My Email" functionality from your iOS device. Neat idea...except that it doesn't seem to work for me, on my iPhone 12 Mini running iOS 15.4.1. I just get an error message …

I'm only a couple hours into my day today and so far I've received three different emails from three completely different senders, each inviting me to go look at the same exciting erotic webcam site. Each email message came from what I think is a legitimate sender -- th…

Greylisting is where an ISP or mailbox provider configures their mail server to temporarily delay incoming email. Usually not long -- perhaps for only 60 seconds to a few minutes. How? Mail servers that support this have a setting where they track server connections. If it'…

Let's talk about domain warming. Specifically, what can happen when domain warming goes wrong (or isn't considered) -- sending too much volume too fast, without enough domain reputation history. This can cause painful inbox woes and it isn't always easy to know what…

Here’s a question that a friend asked me lately:  What does the SpamAssassin "HEADER_FROM_DIFFERENT_DOMAIN" rule ("From and EnvelopeFrom 2nd level mail domains are different") mean? First, we need to understand what they mean by From and Envelope From. In th…

Nicholas De Leon of Consumer Reports explains how easy it is to clean the cruft out of your Gmail account  email archive. Very helpful for those of us cheapskates who don't want to have to need to purchase more storage as our Gmail accounts fill up with a never ending mass …

The Friendly From is not quite its own separate header, but it is a field in your from header. It is the text that goes next to your email address in the from header. If the from address header in my email looks like this: From: Al Iverson <aiversontestmail@wombatmail.com&g…

Here's what is sure to be your favorite fun factoid forever from today: At Gmail -- for the domains gmail.com and googlemail.com -- whether or not the username portion has dots in it is irrelevant. If you send mail to al.iverson.mailbox@gmail.com and aliversonmailbox@gmail.…

So, you read my blog post about how content still matters (even if it takes a back seat to IP and domain reputation). And you've done the neutral content test. And you see that you've got a probably content issue. Now what? Here's what. In a recent entry for Kickbo…