breaking news
Microsoft newly rejecting mail lacking DMARC?
As of Friday night, November 6, 2026 (US time), multiple email admins on the Mailop mailing list (and elsewhere) are reporting seeing messa...
Topic
sender requirements
blocklist
Spamhaus Releases Sender Guidelines
While dozens of blocklists have faded into history or irrelevance over the past 25+ years, Spamhaus remains the heavyweight when it comes to...
2026
Email Deliverability in 2026: What's next?
You’re wondering what deliverability changes await us in 2026? I’m so glad you asked! Let’s talk about deliverability in 2026: What’s here n...
bulk sender guidelines
Google warns: Sender requirements enforcement ramping up
As of November 3, 2025, Google has added a new warning to their Bulk Sender Guidelines FAQ page, warning that enforcement "ramps up...
authentication
La Poste: Authentication Required
(See new info at end!) Hey, big senders! It's time for another update regarding enhanced sender requirements put forth by a large mailbo...
best practices
Yes, Google requires opt-in
Every now and then, someone shows up in an email marketing or deliverability forum or chat room, trying to make the case that spam is someho...
b2b
B2B Senders: Do you have to comply?
I've heard the question more than once: "Do Gmail and Microsoft's new sender requirements really apply to us? We're B2B. We...
authentication
Cloudflare now requires auth for email forwarding
As of July 3, 2025, Cloudflare is enforcing a new requirement for its Email Routing platform: Messages must be authenticated with either SP...
bulk sender guidelines
Webinar alert: New Microsoft Sender Requirements
Microsoft recently joined the "top four" mailbox providers (aka "MAGY," Microsoft, Apple, Google, and Yahoo) with update...
best practices
Gmail says: Yes to angle brackets in the Message-ID
Here's a quick reminder for anyone building their own email messages: Gmail wants your Message-ID header to be properly formatted, which...
best practices
Gmail says: No funny (or smiley) business in friendly from
Google recently updated its email sender guidelines with clearer instructions on what not to do when it comes to your sender name (the frie...
Florent Destors
Orange.fr tightens spam complaint thresholds
Sending email messages to French subscribers with mailboxes hosted by Orange? Starting in mid-August 2025, Orange.fr will begin "trigg...
comcast
Sending to Comcast? Be aware!
A Comcast friend has shared, on another forum, some information regarding best practices when sending emails to comcast.net email addresses....
best practices
Cinco de Microsoft is here: What you need to know
What the heck is Cinco De Microsoft? Why, today is. Monday, May 5, 2025, the date when, as announced by Microsoft , non-compliant bulk email...
dmarc
New Microsoft Sender Requirements: Link Roundup
By now, you've probably heard: Microsoft has officially joined the club. Following in the footsteps of Google and Yahoo, Microsoft has a...
2025
The Spam Resource MAGY Sender Compliance Guide
Here it is, the 2025 Spam Resource MAGY (Microsoft, Apple, Google, Yahoo) Bulk Sender Compliance Guide. This contains almost everything you ...
2025
Microsoft Joins the Club: Top four B2C MBPs now require email auth
Deliverability is ever-evolving. Another day, another major mailbox provider raising the bar for bulk email senders. This time it's Micr...
best practices
Email deliverability: What you need to know
I had the pleasure of chatting with MarTech's Constantine von Hoffman recently, helping to explain what deliverability is, why it matter...
bad advice
Google sending requirements: What of B2B?
Just a quick note today to address some bad advice I've seen out there in the wild. The question that I've seen asked is this: The ...