self hosting email server, or server of any type is a small blow against the destruction of the internet. ISP have mixed feelings about it, this is the big con

self hosting email server, or server of any type is a small blow against the destruction of the internet. ISP have mixed feelings about it, this is the big con. your emails may be flagged as spam, your ports may be filtered down to nothing over time, all depending on how your provider views server hosting. residential grade connection ususally is not allowed to host servers other than tech industry snooping devices. security is a bigger con, its a major inconveinience to discover you are a major contributor to crimes and haxn via your server. a sudden invoice for extreme bandwidth usage may be received, not so bad as if you were mirroring YTUBE, but not cost effective to say the least. make sure you do your homework, and have data, sware, and hware backups if its a seriously mission critical server.