[enhancement]: Spam filter OCR and QR-code reading

[TaaviE]

Which feature or improvement would you like to request?

I'd love to see really simple/barebones OCR and QR link/text extraction built into Stalwart. This would make it somewhat harder to bypass the spam filter by just using images.

Is your feature request related to a problem?

Recent phishing waves have started using images to bypass the spam filter. While some other approaches might be able to mark letters like that suspicious, being able to actually see the content linked would be a great improvement.

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