[Email Security] Accept sender disclaimer

[Maddy-Cloudflare]

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PR Change Summary

Updated Email Security documentation to include a caution regarding the 'Accept sender' feature and its implications for sender verification.

• Added a caution note about enabling the 'Accept sender' feature.
• Clarified that 'Sender verification (Recommended)' should always be turned on when using 'Accept sender'.
• Highlighted potential security concerns related to enabling 'Accept sender' for certain companies.

Modified Files

• src/content/docs/cloudflare-one/email-security/detection-settings/allow-policies.mdx

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[github-actions]

This pull request requires reviews from CODEOWNERS as it changes files that match the following patterns:

Pattern	Owners
/src/content/docs/cloudflare-one/	@ranbel, @cloudflare/pcx-technical-writing

[github-actions]

Preview URL: https://88e570c0.preview.developers.cloudflare.com
Preview Branch URL: https://maddy-email-security-pcx-18328.preview.developers.cloudflare.com

Files with changes (up to 15)

Original Link	Updated Link
https://developers.cloudflare.com/cloudflare-one/email-security/detection-settings/allow-policies/	https://maddy-email-security-pcx-18328.preview.developers.cloudflare.com/cloudflare-one/email-security/detection-settings/allow-policies/