Add optional MTA-STS policy fetch and popup diagnostics - #12

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TJBK wants to merge 15 commits into

LukeSteward:mainfrom

TJBK:expanded-mail-providers

Commits on May 15, 2026

Add copyable audit report
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8e38dc7
Add manual domain checks
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3779892
Add remediation guidance
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5d4ad58
Add custom DKIM selectors
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10e9dde
Add root and hostname comparison
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3e743b3
Expand mail provider profiles
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2d38c0f
Add optional MTA-STS policy fetch
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0002ce7
Add score explanation view
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1913a96
Show MTA-STS policy fetch state
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c6b1006
Add MTA-STS policy fetch regression test
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08133d1
Add 32 additional mail provider profiles for better detection coverage
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e6a8bb6
Fix MTA-STS disclosure text
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54847a0
Restore MTA-STS experimental label
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d10c670
Address popup and MTA-STS review feedback
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ed2e41a
Remove MTA-STS HTTPS policy fetch
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f0eadf2