Top Deliverability’s Blog
Spam Resource: Hotmail.com SPF issue on August 18th
- August 18, 2023
- Posted by: Top Deliverability
- Category: Industry News Spam Resource
Al Iverson just issued another interesting post on Spam Resource:
Looks like Microsoft has run into email authentication issues today. Specifically, the domain hotmail.com appears to have a broken SPF record wherein messages sent by Hotmail/Outlook.com/Microsoft OLC using a hotmail.com from address aren’t passing SPF authentication. Here’s a link to a KBXSCORE report I’ve run, showing the failure.While hotmail.com is affected, the outlook.com domain doesn’t appear troubled — my test sends from an outlook.com from address seem to pass SPF. (Microsoft has many other domains; I’ve only checked these two.)Looking at the SPF records for hotmail.com, here’s what I see:hotmail.com descriptive text “v=spf1 include:spf-a.outlook.com include:spf-b.outlook.com ip4:157.55.9.128/25 include:spf-a.hotmail.com include:_spf-ssg-b.microsoft.com include:_spf-ssg-c.microsoft.com -all”outlook.com descriptive text “v=spf1 include:spf-a.outlook.com include:spf-b.outlook.com ip4:157.55.9.128/25 include:spf-a.hotmail.com include:_spf-ssg-b.microsoft.com include:_spf-ssg-c.microsoft.com include:spf.protection.outlook.com ~all”The hotmail.com SPF record is missing “include:spf.protection.outlook.com” — which is present in the outlook.com SPF record. And I see it present in a cached copy of Hotmail’s SPF record that I collected last month. So, I suspect that to be
Read the original here: Hotmail.com SPF issue on August 18th
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