I know a bunch of people (including me) who decades ago wished they had a private sendmail.cf expert at their elbow, and even a few sendmail.cf experts who were sick and tired of always being asked to help random people with their sendmail.cf file for free.

Maybe there will be a resurgance of terribly obscure totally unique quirky configuration files for all these vibe coded apps, unique enough that they don't appear in the training data, so you have to hire real humans to sit at your elbow and help you!