Article

How to Get Emails Delivered to Microsoft & AOL | How ISPs Filter

Chris Arrendale

< 1 minute

How to Get Emails Delivered to Microsoft & AOL | How ISPs Filter

Microsoft

Emails delivered to Microsoft & AOL means you are following email deliverability best practices. Deliverability to Outlook.com is based on your reputation. Microsoft releases reputation data via its Smart Network Data Service (SNDS) program. Windows Live Hotmail uses SPF and DKIM authentication. They filter email using Symantec/Brightmail Probe Network, Smartscreen filtering, and other content-level filtering. Blocking may result from being listed with Brightmail; removing those blocks requires contacting Symantec, not Hotmail. The Outlook.com Smart Network Data Service (SNDS) gives you the data you need to understand and improve your reputation. Data includes filtering, complaint rate, and spam trap hits.

What Microsoft Looks for in Email Deliverability Best Practices

  • Sending reputation
  • They release reputation data via SNDS
  • DKIM and DMARC authentication
  • They filter using Symantec/Brightmail Probe Network, Smartscreen filtering, and other proprietary content-level filtering
  • Listing (If you’re listed with Brightmail, Microsoft may block you)

AOL

AOL focuses heavily on DKIM authentication and references the block lists maintained at The Spamhaus Project.Their spam filter is proprietary and custom-built. Metrics such as complaints, unknown users, content, bounce processing, and spam traps influence AOL’s inbox placement.

What AOL Looks for in Email Deliverability Best Practices

  • DKIM Authentication
  • Spamhaus References
  • Proprietary & customer-built
  • Complaints
  • Unknown Users
  • Content
  • Bounce processing
  • Spam traps

Need deliverability help? Contact one of our email deliverability experts.

Trendline Interactive

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About the Author(s)

Chris Arrendale

Founder of Inbox Pros (acquired by Trendline in July of 2018). Author of Deliverability Inferno. Certified expert and frequent speaker on the topics of data privacy, deliverability and compliance. BA in Poli-Sci/Soc from Emory, MS in Software Engineering & IT from Southern Polytechnic State University. A shoe and wine collection that’s the envy of pro athletes. Follow Chris on LinkedIn

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