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Sparkpost emails going straight to Junk Mail (o365)


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It seems you may have switched from Mandrill to Sparkpost in the last 24 hours, now every email I get is going to Junk Email on o365 with a spam confidence level of 9.

Are you using a dedicated ip or just the pool Sparkpost use?

I can send the headers through if that would help. I personally found the exact same problem when I was testing SendGrid and its dedicated ip.

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  • 1 month later...

Just to add it appears IPB are not using a dedicated ip which seems to explain why 25-50% of mail sent is getting junked on o356/outlook.com/hotmail.com email addresses went it comes from one of the *general* ip's.

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  • 10 months later...


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