• Log In
  • Sign Up
  • Contact Us
PowerDMARC
  • Features
    • PowerDMARC
    • Hosted DKIM
    • PowerSPF
    • PowerBIMI
    • PowerMTA-STS
    • PowerTLS-RPT
    • PowerAlerts
  • Services
    • Deployment Services
    • Managed Services
    • Support Services
    • Service Benefits
  • Pricing
  • Power Toolbox
  • Partners
    • Reseller Program
    • MSSP Program
    • Technology Partners
    • Industry Partners
    • Find a partner
    • Become a Partner
  • Resources
    • DMARC: What is it and How does it Work?
    • Datasheets
    • Case Studies
    • DMARC in Your Country
    • DMARC by Industry
    • Support
    • Blog
    • DMARC Training
  • About
    • Our company
    • Clients
    • Contact us
    • Book a demo
    • Events
  • Menu Menu

Microsoft OLC Email Deliverability Guide

Blogs
Microsoft OLC Email Deliverability Guide

Microsoft consumer mailboxes (like Hotmail, Outlook, Live, and MSN)  have strict spam filters, making it difficult for senders (even legitimate ones) to have their emails always land in the desired recipients’ mailboxes. Microsoft is harsh towards illegitimate senders and, thus, is the quickest to block messages/ senders or mark them as spam. 

This doesn’t sit well, especially with email marketing experts as Outlook.com is the third-most-popular email service provider and is used by over 400 million users. This means there’s always a high possibility of marketing emails landing in junk folders. So, let’s explore if there’s anything that you, as senders, can do at your end to avoid such situations.

Microsoft OLC’s Spam Filters Aren’t Enough

Multiple complaints are scattered online about how Outlook’s spam filters have gone unreliable and unreasonable lately. Believe it or not, Outlook users have to check their junk folders multiple times a day because this is where they expect genuine conversations to land.  

It’s identifying even allowlisted senders and mail servers as spam. What’s worse is that resolution of such issues takes much longer than other mailbox providers. 

How to Ensure Emails Land in Microsoft Consumers’ Inboxes?

550 5.7.1 Unfortunately, messages from [x.x.x.x] weren’t sent. Please contact your Internet service provider since part of their network is on our block list (S3150). You can also refer your provider to http://mail.live.com/mail/troubleshooting.aspx#errors. [#.eop-nam02.prod.protection.outlook.com]

If you get the above-mentioned bounce message now more than ever, then you need to renew your mailing list, get unblocked as a sender, and follow these five tips.  

1. Deploy SPF, DKIM, and DMARC

SPF (Sender Policy Framework) allows domain owners to specify which IP address or mail servers are authorized to send emails on their behalf. Emails sent by any other senders are marked as spam, or they bounce back.

DKIM (DomainKeys Identified Mail) uses a pair of cryptographically-secured keys that help verify the sender’s authenticity by involving DKIM signatures on outbound emails.

DMARC tells recipients’ servers what to do with emails that fail SPF and/or DKIM checks. You can set a suitable DMARC policy to instruct them to take no action against such messages, mark them as spam, or reject their entry. 

Click here to read: DMARC or email marketers.

Combining these three protocols establishes your domain as legitimate and trustworthy while keeping hackers at bay. 

2. Warm-up New Email Accounts

Email warming scales your outreach by gradually instilling trust in recipient mailboxes. This builds your reputation as a legitimate sender and helps pass Microsoft OLC spam filters. You can follow this standard ramp-up routine for new email accounts-

Days Number of maximum emails to send per day The gap between two consecutive emails
1-3 15 450 seconds
4-7 25 400 seconds 
8-10 40 250-300 seconds  
11-14 70 200 seconds
15-20 150 100 seconds
21-30 200-250 >67 seconds

Go slow; it will take around 3 to 4 weeks for you to reach the number of emails you actually want to send per day.

3. Sign Up for SNDS

SNDS stands for Smart Network Data Service, a reputation portal introduced by Microsoft that enables you to comprehend problems pertaining to the deliverability of your domain. Once you have signed up, request access, and check data about all your sending IP addresses. It lets you know if your emails are being marked as spam and whether your reputation is red, yellow, or green.

It’s a matter of concern if your sending IPs’ reputation is consistently being marked as red. This indicates that most people are categorizing your messages as spam-y or due to Outlook’s Spam Fighters program., popularly known as Sender Reputation Data (SRD). 

Microsoft builds SRD by asking some of your subscribers if they recognize your messages as spam. If they tap on the ‘yes’ option, your deliverability gets hampered. To save your email-sending domain or IPs from this-

  • Renew and revise your mailing lists
  • Don’t buy lists from just anybody selling them off
  • Ensure creating valuable messages and newsletters
  • Refrain from putting up questionable content
  • Cut down your mailing list to only engaged subscribers

4. Avoid Being Mistakenly Considered a Namespace Mining Practitioner

“More information needed

177.43.254.226

There are indications that the above IP(s) are engaged in namespace mining. Outlook.com is blocking all emails sent from this IP.”

The above reply indicates that your IP/IPs are observed engaging in namespace mining. Namespace mining is the user behavior of verifying email addresses without actually sending messages to them. It’s commonly practiced by threat actors, and that’s why Microsoft condemns it outrightly. 

You get tagged for namespace mining even when you don’t engage in such practice; this happens when your mailing list is old and unrevised. You are advised to go through your domain’s sending log to pull out subscribers corresponding to nonexistent @hotmail.com, @live.com, @msn.com, and @outlook.com.

5. Pull Back and Focus on Engagement

If your emails are consistently being placed in the junk folder of Microsoft OLC recipients, it’s time you take a drastic shift in your email-sending approach. Temporarily stop sending emails to subscribers that haven’t opened your messages at all in the last X days. Now, X varies from industry to industry and can be anywhere between 15 to 180 days; if you aren’t sure, start by considering X as 60 days. 

If you notice any depreciation in the spam placement in the next 4-5 weeks, continue this pattern; otherwise, you can restart sending them messages.

Conclusion

We at PowerDMARC can help you take the first step by supporting you in getting started with email authentication protocols with our DMARC analyzer. We have aided thousands of customers and hundreds of organizations in building trust, protecting their domains against email fraud, and improving email deliverability. You can contact us today, and one of our experts will get back to you with the support and guidance your brand requires, or take a free 15-day trial of our platform!

Microsoft OLC email deliverability

 

  • About
  • Latest Posts
Ahona Rudra
Digital Marketing & Content Writer Manager at PowerDMARC
Ahona works as a Digital Marketing and Content Writer Manager at PowerDMARC. She is a passionate writer, blogger, and marketing specialist in cybersecurity and information technology.
Latest posts by Ahona Rudra (see all)
  • How to Protect Your Passwords from AI - September 20, 2023
  • What are Identity-based Attacks and How to Stop Them? - September 20, 2023
  • What is Continuous Threat Exposure Management (CTEM)? - September 19, 2023
July 28, 2023/by Ahona Rudra
Tags: Microsoft email deliverability guide, Microsoft OLC, Microsoft OLC email deliverability, Microsoft OLC Email Deliverability Guide
Share this entry
  • Share on Facebook
  • Share on Twitter
  • Share on WhatsApp
  • Share on LinkedIn
  • Share by Mail

Secure Your Email

Stop Email Spoofing and Improve Email Deliverability

15-day Free trial!


Categories

  • Blogs
  • News
  • Press Releases

Latest Blogs

  • How-to-protect-your-Password-from-AI
    How to Protect Your Passwords from AISeptember 20, 2023 - 1:12 pm
  • What are Identity-based attacks and how to stop them_
    What are Identity-based Attacks and How to Stop Them?September 20, 2023 - 1:03 pm
  • Microsoft OLC email deliverability
    What is Continuous Threat Exposure Management (CTEM)?September 19, 2023 - 11:15 am
  • What-are-DKIM-Replay-Attacks-and-How-to-Protect-Against-Them
    What are DKIM Replay Attacks and How to Protect Against Them?September 5, 2023 - 11:01 am
logo footer powerdmarc
SOC2 GDPR PowerDMARC GDPR comliant crown commercial service
global cyber alliance certified powerdmarc csa

Knowledge

What is Email Authentication?
What is DMARC?
What is DMARC Policy?
What is SPF?
What is DKIM?
What is BIMI?
What is MTA-STS?
What is TLS-RPT?
What is RUA?
What is RUF?
AntiSpam vs DMARC
DMARC Alignment
DMARC Compliance
DMARC Enforcement
BIMI Implementation Guide
Permerror
MTA-STS & TLS-RPT Implementation Guide

Tools

Free DMARC Record Generator
Free DMARC Record Checker
Free SPF Record Generator
Free SPF Record Lookup
Free DKIM Record Generator
Free DKIM Record Lookup
Free BIMI Record Generator
Free BIMI Record Lookup
Free FCrDNS Record Lookup
Free TLS-RPT Record Checker
Free MTA-STS Record Checker
Free TLS-RPT Record Generator

Product

Product Tour
Features
PowerSPF
PowerBIMI
PowerMTA-STS
PowerTLS-RPT
PowerAlerts
API Documentation
Managed Services
Email Spoofing Protection
Brand Protection
Anti Phishing
DMARC for Office365
DMARC for Google Mail GSuite
DMARC for Zimbra
Free DMARC Training

Try Us

Contact Us
Free Trial
Book Demo
Partnership
Pricing
FAQ
Support
Blog
Events
Feature Request
Change Log
System Status

  • Français
  • Dansk
  • Nederlands
  • Deutsch
  • Русский
  • Polski
  • Español
  • Italiano
  • 日本語
  • 中文 (简体)
  • Português
  • Norsk
  • Svenska
  • 한국어
© PowerDMARC is a registered trademark.
  • Twitter
  • Youtube
  • LinkedIn
  • Facebook
  • Instagram
  • Contact us
  • Terms & Conditions
  • Privacy Policy
  • Cookie Policy
  • Security Policy
  • Compliance
  • GDPR Notice
  • Sitemap
What is Domain Abuse?What is domain abuseGMAIL “Best Guess” SPF Status - What Does This Mean?GMAIL “Best Guess” SPF Status – What Does This Mean?
Scroll to top