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Question Emails still hitting spam even after SPF/DKIM fixed

issjenuw

New Pleskian
Server operating system version
almalinux
Plesk version and microupdate number
.42.1.10060
Hey folks,

I’ve set up SPF and DKIM correctly — both check out fine on MailTested — Email Deliverability & Spam Test Tool

But Outlook still keeps marking my emails as spam, while Gmail delivers fine.

Ran a quick deliverability test please see the result here:


Score’s around 9/10, so not terrible.

Is Outlook just way stricter these days or am I missing something obvious?


Thanks.
 
The issue may not lay within the configuration. It will be helpful if you can include the header of an example email that was flagged as spam in Outlook.
 
Strange thing is, when I send via SMTP directly, I get a 10/10 score. But when I send using PHP’s mail() function (which is configured to relay through SMTP), the issue appears.

Screenshot 2025-11-02 at 2.11.45 AM.png
 
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