How and where can I fix and add proper PTR Records in Cloudron?
@zion PTR records are only modifiable by your ISP. Cloudron has no control over that.
Ask your hosting provider to update the PTR record with your IP and hostname (FQDN of the server)
~ Professional Nerd. Freelance Programmer. ~
See this - https://docs.cloudron.io/email/#ptr-record