[tscs37]

Receipts and (most likely) EMails will not be affected. The former since it has to be kept around for tax purposes and the later since they fall under freedom of expression, both are exempted from the GDPR.

The paper you printed to ban someone from you store falls under Art1, §1, Section f of the GDPR; your interest in keeping that person out of the store outweighs their interest in keeping their details private.