If, after sending an email, it turns out that the customer wants to receive standard letters instead of emails, you can still change this.
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Don't want to change the invoice process, but instead send an already sent invoice or reminder by post to your customer just once? You can set this up in the timeline of the invoice or case.

To do so, go to the timeline of the invoice or case in question. Click on the three grey dots on the right, and select '(Re)send letter. A pop-up will appear with the address details. Check the details and click 'Send letter'.

Note: You can only resend the invoice and the most recent reminder.