apple
Mac Users Face Microsoft 365 Sync Issues as EWS Phased Out
If you or your users rely on Apple Mail on macOS to access Microsoft 365 work or school accounts, you may soon run into unexpected sync disr...
All posts
best practices
DOI vs. COI: The Pointless Word War
It's time for a trip down memory lane. We're going way back. Before "deliverability" was even a recognized industry term, ...
friend
Need Inbox Help? Ask Jen!
Looking to hire a deliverability consultant to help investigate and fix your inbox woes? J ennifer Nespola Lantz can help. She and I previo...
platforms
Posta: Run Your Own Email Sending API
When you’re launching a brand new SaaS application or service, you know it’s going to send emails. That means you’ve got to pick an email de...
ask al
Ask Al: What is Backscatter? (2026 Version)
I’ve written about backscatter before . (And so has USA Today .) And I’ll probably write about it again. Backscatter, at a high level, is d...
changes
Dead domains (sort of): TDS Telecom offloading email service
Another regional internet service provider is getting out of the consumer mailbox hosting business. TDS Telecom has announced that it is win...
bad ideas
Goofus and Gallant: 3 Missed Opportunities to Do the Right Thing
Sometimes progress in email marketing best practices feels like two steps forward, one step back. Over the weekend, three emails landed in m...
dead domains
Dead domain: mydurango.net
If you've got email subscribers on your list from Colorado and New Mexico, take note: the mydurango.net email domain is officially dead....
bad ideas
Bad Ideas: Why Giving Your Email List to a Third Party Is Just Dumb
A story recently broke on 404 Media that made deliverability experts everywhere cry a little inside: YouTube channel Channel 5 admitted to h...
apple
iOS27: Bringing Apple Mail Improvements
Apple will officially release iOS 27 on Monday, September 14, 2026. With that release comes an updated version of Apple Mail on mobile. 9to5...
blocklist
New from Validity: The Heatwave Domain Blocklist
Validity just launched something very interesting: the Heatwave Domain Blocklist , and the goal is to identify and measure reputation of dom...
gmail
GPT: Let’s Talk Deliverability Analysis
Google Postmaster Tools V2, in both its user interface and API, offers information that they call a “Deliverability Analysis” (or “Deliverab...
ask al
Ask Al: GPT Transition, Reputation, and Issues
In my latest Ask Al video for Valimail , I walk viewers through the current state of Google Postmaster Tools , the very important sender fee...
bounces
Mailbox full: Not always an inbox problem
When an email bounces back with a "mailbox full" or over-quota SMTP rejection, the standard assumption is that a subscriber has le...
gmail
Google Resurrects Its Verified Political Sender Program
Remember Google's program to verify US political senders? (Which Jennifer Nespola Lantz covered for Spam Resource back in 2022, see here...
apple
Apple Not Changing "Hide My Email" Addresses After All
In July, I reported that Apple planned to migrate domains for both iCloud Private Relay (Sign in with Apple) and "Hide My Email"...
bugs
Having trouble adding users and domains in GPT V2?
Multiple folks have reached out asking why they're having trouble adding new domains or users in the new Google Postmaster Tools (GPT) V...
dmarc
I’m a DMARC fan. Are you?
Based on this totally scientific, absolutely guaranteed to be accurate poll that I ran on Linkedin for the past week or so, DMARC is almost...
gmail
GPT: V1 Retirement and Important Updates
Things are happening in the world of Google Postmaster Tools. If you’re a long time user of Google’s sender reputation dashboard known as Go...
ask al
Ask Al: How do you actually set up a BIMI logo?
In previous videos, I’ve talked a lot about BIMI sender logos, often in the abstract. Many people do seem to understand what a BIMI logo is,...
admin
Email Isn't Dead, and Neither Is This Blog: Spam Resource at 25
When I published my very first post back in August 2001, I never envisioned that I'd still be sitting at a keyboard twenty-five years la...
privacy
No Reply, Not Your Domain? Yes, Problem
As reported by Ars Technica , security researcher Cory Solovewicz owns the domains noreply.net and noreply.us. Every day, he sees nearly 700...
data
Fun with data: Progressive sender list breakdown
Here's a quick data snapshot that a friend was kind enough to share. The friend manages a smaller progressive sender email list, and he ...
deliverability
Lukas Lunow: Why Does Microsoft Trash My Emails?
If you're living in the land of Salesforce Marketing Cloud and struggling when it comes to getting your emails reliably delivered to Mic...