While you can change the local part of the email address used for opt-out emails sent by EmailFinder to match the name of your organization, the domain is set as "@dg1.supersendingsystempro.com/lists/it.php" (or "@dg1.supersendingsystempro.com" depending on which Knowledgebase article you're reading), where the domain can have dg1-dg12.

While the email is actually just a benign message with a link to opt-out, the domain name makes it look very suspicious, and it seems more likely to be caught by spam filters or reported as spam by constituents. If the domain was customizable (or even if it was just shorter and looked less like a bot sent it), it could increase EmailFinder's success rate and usability.