hotmail
Wait, what is Microsoft SNDS? (for 2026)
Every time I post about changes to Microsoft SNDS, somebody always asks, “What, what is Microsoft SNDS? How do I use it?” And so, to be proa...
Topic
hotmail
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
Navigating Microsoft OLC Spam Folder Placement
Microsoft’s Outlook.com or OLC (Outlook Consumer) email platform, the mailbox provider formerly known as Hotmail, can be a tricky one when i...
domains
Microsoft OLC/Hotmail Domains List (Updated for 2025)
Here it is, the first episode of "Fun with Data" for 2025. Today, I present to you a link to a downloadable list containing the to...
email headers
Microsoft: Decoding hidden spam-related headers
Did you know that Microsoft Outlook.com and O365 emails include special headers that break down the spam filtering results for email message...
hotmail
MBP Spotlight: outlook.com
Who hosts what mail? MBP Spotlight is the new series here at Spam Resource where I’ll share ranking data for the top mailbox providers (in...
dns
Microsoft errors: 5.4.4 (unable to route: no mail hosts for domain)
When sending to Microsoft OLC (Outlook Consumer - i.e. hotmail.com, outlook.com, msn.com, live.com, etc.) domains, are you seeing this bounc...
authentication
Hotmail.com SPF issue on August 18th
Looks like Microsoft has run into email authentication issues today. Specifically, the domain hotmail.com appears to have a broken SPF recor...
authentication
Microsoft: Body hash did not verify error
If you're seeing intermittent DKIM authentication failures at Microsoft domains (outlook.com, hotmail.com, etc.) -- meaning you're s...
hotmail
ISP Deliverability Guide: Microsoft OLC (Updated for 2023)
Successful inbox delivery to Microsoft consumer mailboxes (referred to as Outlook.com, Hotmail.com, or Microsoft "OLC") can be tri...
downtime
Outlook spam filters fall down, go boom
Mashable's Tim Marcin and others are reporting that a failure in Microsoft's spam filtering has resulted in Outlook.com (Hotmail) ...
downtime
Problems sending to Microsoft over IPv6? You're not alone
Multiple folks over on the Mailop list are reporting that Microsoft OLC (Outlook.com/Hotmail/etc)'s IPv6 inbound mail servers are defer...
hotmail
New info in Microsoft SNDS
Check it out! It looks like Microsoft has updated SNDS to provide a bit more info than they provided previously. In the "Comments"...
downtime
SNDS shows no data from June 17th - June 21st
It's not just you! Microsoft's Sender Network Data Services reputation portal seems to have stopped updating. The last date with IP...
hotmail
Requesting pre-emptive accommodation from Microsoft
If you are new to your sending IP addresses -- meaning you're going through IP warming, you are likely to find that Microsoft OLC (Hotma...
amp
AMP: The next big thing? Not at Outlook.com
Once upon a time I asked if AMP dynamic content functionality was going to be " the next big thing " as far as email is concerned....
hotmail
Help! I'm blocked at Microsoft! What do I do?
Keep in mind that Microsoft has two separate mail systems: OLC (Outlook Consumer) which you might call Hotmail, and corporate mail hosting, ...
brad gurley
Outlook.com has tabs now, too?
What? This seems new. Brad Gurley talks about this over on his Delivery Counts blog . He says the tabs that show up include "Focused In...