I recently set up kubernetes to run on an old laptop. The goal was two-fold, 1 learn kubernetes and 2 setup an instance of nextcloud. I've managed to set everything up with cert renewals for my domain and enabled dyndns in case my provider changes my ip. All well and good and quite nice learning experience! Now I would like to also start running my own email server and have some questions. Is ther any that have a helm chart that is easy to setup in kubernetes? Since I am running this from home I imagine I'm more likely to be classified as a spammer. What can I do to minimize the likelihood of that? I read somewhere about reverse DNS, but not entirely sure if it is possible to do given I am running it all at home via a regular ISP.