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@Terry53029 wrote:

I never send clients returns through normal email, as it is not secure. There are several services, that send them encrypted for you. I personally use Encyro, as it is easy, and very affordable

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Same here.  We use Verifyle.

If we do trade sensitive info over email, we would turn on the encryption option with a finite valid period in ProtonMail, which our non-ProtonMail clients can open with a passphrase which we communicate to them separately by a different means, much like how insurers communicate with customers.