Spam Resource: All Things Deliverability
I'm Al Iverson and I'm here to help. You've got questions about email deliverability? Find answers here! This is where I've been writing about email technology, sender requirements and best practices, email authentication, stopping spam, and more, for twenty-four years. And if you can't find an answer in one of the 1700+ articles here, drop me a line with your question, and I'll try my best to follow up. And don't forget to subscribe to my email newsletter, so that you'll get updated info pushed to your inbox weekly.
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Friday Fun: The Fascinating Story of Hotmail

Friday Fun: The Fascinating Story of Hotmail

Looking for a fun way to kill some time before you wrap it up ahead of the weekend? This might help. This YouTube video dives into the history of Hotmail, from how Sabeer Bhatia and Jack Smith came up with the idea for free webmail, to its explosive viral growth, and ultimately Microsoft's $400 million acquisition in 1997. What you perhaps did not know: After buying Hotmail, Microsoft discovered that one of its biggest internet services wasn't running on Windows at all! It was powered by U…

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The Latest Deliverability News

Friday Fun: The Fascinating Story of Hotmail

Looking for a fun way to kill some time before you wrap it up ahead of the weekend? This might help. This YouTube video dives into the history of Hotmail, from how Sabeer Bhatia and Jack Smith came up with the idea for free webmail, to its explosive viral growth, and ultimatel…

Infobip Acquires SocketLabs

In the latest round of email industry consolidation, cloud communications giant Infobip has announced its acquisition of email marketing and infrastructure platform SocketLabs . Infobip is a global cloud communications platform focused primarily on SMS-based communication. The…

How does a mailbox provider support and display BIMI logos?

If you’re wondering exactly how a mailbox provider like Yahoo, Google, Comcast or Fastmail might implement support for decoding and displaying BIMI (Brand Indicator for Message Identification) logos in or near the inbox, then I’ve got you covered. TL;DR? It boils down to: Valid…

RE: Don't Do This: Google's Guide to Keeping Gmail Happy

Google recently published a highly practical new help article: Top 10 Gmail sender issues . Here's how to prevent the most common hurdles you might run into when sending mail to Gmail. Seasoned senders will recognize core pillars like authentication (SPF, DKIM, DMARC) and m…

Apple changing hide my / sign in domains

Apple put out a notification on June 15th that soon, the domains for "Hide My Email" and "Sign in with Apple" masked email addresses will be changing. Previously, "Hide My Email" addresses were generated under the default icloud.com Apple consum…

Which ESP is Best for Deliverability? (Spoiler: Wrong Question)

Just the other day, I saw someone post another one of those "Deliverability Ranked by ESP" charts, and frankly, it drives me nuts. These charts are inaccurate and misleading. There is no useful way to generate a single "snapshot metric" that tells you you…

ESPC Webinar: Evolving EU Regulation of Tracking Pixels

If you've been watching data privacy developments in Europe, you already know that the current rules around open tracking (pixel tracking) in email marketing are ... messy , to put it mildly. The regulatory environments in France (CNIL) and Italy (Garante) have thrown a lot…

Bad ideas: From Sticky Widgets to the Spam Folder

Let’s say you run a business selling, oh, I dunno, widgets. Maybe sticky, flat widgets, printed on one side, where you peel off the back so buyers can slap them onto a laptop or a bumper. You’ve sold a lot of those widgets over the years, which means you’re sitting on a massive…

SNDS and JMRP in transition

Microsoft's sender reputation data portal ( Smart Network Data Services , or SNDS) and their ISP feedback loop mechanism (Junk Mail Reporting Program, or JMRP), are undergoing a transition. The SNDS website relaunched in June, 2026, with updated access controls and some ch…

From DMARCbis to DMARC: New DMARC RFCs

DMARC has been updated! Three new RFCs have been published (RFCs 9989 , 9990 , and 9991 ) governing the latest incremental updates to the DMARC standard. TL;DR? It's all about the DNS tree walk, privacy concerns around failure reporting, and removing little used flags (PCT,…

Troubleshooting 4 different types of Microsoft DKIM rejections

If your attempts to send email to Microsoft-hosted inboxes are bouncing back intermittently with authentication-related rejections; specifically highlighting that DKIM is failing, when you know you’ve got DKIM authentication correctly implemented: what do you do now? The actual…

CNIL open tracking restrictions are coming and complex

CNIL, France’s data protection and privacy authority , recently announced new restrictions and requirements related to open tracking (aka pixel tracking) and things are relatively complex. The TL;DR is that permission is required before tracking opens, there’s a potential exemp…

CU Boulder shutting down alumni email service

If you’ve got an active alumni email account from the University of Colorado Boulder, you might have already seen the announcement : Your alumni email account is going away as of August 31, 2026. This affects email accounts in the domain colorado.edu — not all accounts, as this…

Learn more about DMARCbis

DMARCbis: What is it and what do you need to know? It’s the updated version of the email authentication-related DMARC internet specification, and it modifies how DMARC works in a few small, but important, ways. If you’re curious to learn more, check out my latest Valimail &quo…

ICYMI: BIMI success stories and data

Curious about BIMI adoption rates? Looking for BIMI success stories? The fact is, BIMI helps boost email engagement. And if you’re looking for the data to make the business case for BIMI, this recent webinar has what you need to help you support the argument for implementing a …

More on DKIM2: VERP, async bounces, signatures and hops

As you might have seen me mention on Linkedin this week, I'm still working to fully wrap my head around DKIM2, specifically thinking about a couple of different things: the impact on DMARC and the impact on ESP platforms. Let me tell you what I know and what I don't kno…

GMX/WEB.DE/mail.com moving to inbound DMARC enforcement

Staff from mailbox provider GMX/WEB.DE/mail.com (1&1 Mail & Media GmbH) have just announced on the Mailop list that they'll begin enforcement of DMARC checks in a phased rollout over the coming weeks. What does this mean? It means that if you publish a DMARC polic…

Zeta: Q1 2026 Email Marketing Benchmarks

Zeta Global just posted their latest email and SMS benchmark report. Curious about open, click and unsub percentages across a whole bunch of industry sectors? Zeta's got that. Retail, Financial Services, Travel and Hospitality, Media and more. It's good stuff, especiall…

Microsoft DKIM Failures? Check for double headers

Another day, another issue with DKIM signatures. As has happened before, and as will likely happen again, everything looks great for an email message at mailbox provider A, but gets rejected or otherwise runs into trouble at mailbox provider B. If you’ve been in email deliverab…

DELIVTERMS: MTA-STS

It's time for another installment of our DELIVTERMS series here on Spam Resource, where we help you digest and understand the alphabet soup of email technology. Today, we're looking at MTA-STS (and TLS Reporting). MTA-STS stands for: Mail Transfer Agent-Strict Transpor…

Webinar Alert: When Email Deliverability Isn't Enough: Turning Trust Into Brand Impact

If you want to learn more about the value of and potential benefit from BIMI (Brand Indicators for Message Identification), the inbox logo standard that helps you build email trust and boost engagement with your subscribers, then this is the webinar for you! Join Al Iverson (Va…

Mickey Chandler: DKIM Failing at One Domain Is Not a Key Issue

My friend Mickey Chandler recently posted a great new blog post explaining what an email sender can do with DMARC aggregate reporting. Specifically, what the reporting can tell you with regard to troubleshooting mailbox provider-specific email authentication failures. What you …

What is DKIM2? What do you need to know?

There have been a few different blog posts, Linkedin posts, and email newsletters talking about DKIM2 lately. And oof, most of them seem to get one or more of the details wrong. People mean well, so let's forgive them -- this is a complex thing, and it's easy to misunde…

The Case for Reactivation (and Sunsetting)

We often talk about the importance of "keeping a clean house" when it comes to deliverability. But list hygiene isn't just about bouncing bad addresses; it’s about managing the entire subscriber lifecycle to ensure mailbox providers see you as a sender people actu…

Weird DKIM failures? Check your header lengths

If you’re running into issues with DKIM signatures failing when sending to Microsoft domains, but working fine elsewhere, one thing to check is that your various email headers aren’t too long or wrapped improperly. Postmark’s blog post from January touches on this very issue ; …