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I get an internal security error when trying to block or permanently delete these emails with the red badge (icon).

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Do you mean this icon?

enter image description here

This icon means the email has a valid digital Signature. (What do the Outlook icons mean?)

For Encrypted emails, try Shift+Delete and choose Yes.

Some ways are also mentioned in these similar threads:

Unable to delete email: "Your digital ID name cannot be found by the underlying security system"

Can't permanently delete an encrypted e-mail...

Since you no longer have the certification to operate the encrypted message, the workaround is to drag these emails to a new PST file and then delete that PST file.

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