I use a cheap host for my personal use. Years ago, when I first started with them, I wanted to set reverse DNS and was told you have to request permission to do that cause it's not allowed by default. I received permission and have been happily humming along till today when I noticed something in my mail logs that I hadn't seen in a long time. Looking through all my configurations and I found that reverse DNS was pointing to the wrong subdomain.
Now maybe I changed it and forgot about it cause I do a fair bit of tinkering but I opened a ticket and was told they no longer allow users to set rDNS themselves. You have to submit a ticket and they will change it for you but, like I said, I do a fair amount of tinkering at times and I really don't want to have to wait an unknown amount of time for a ticket to get filled.
I presume it's because some must be doing nefarious or stupid things which cause issues but other hosts offer the ability.
Now maybe I changed it and forgot about it cause I do a fair bit of tinkering but I opened a ticket and was told they no longer allow users to set rDNS themselves. You have to submit a ticket and they will change it for you but, like I said, I do a fair amount of tinkering at times and I really don't want to have to wait an unknown amount of time for a ticket to get filled.
I presume it's because some must be doing nefarious or stupid things which cause issues but other hosts offer the ability.