On 2022-04-11 15:38, Richard Rasker wrote:
Could I solve this by setting smtp_helo_name in main.cf to 77-172-184-9.fixed.kpn.net ? Or is this a bad idea?
no this will not solve it, you have to talk to isp kindly ask for change of ptr, if thay are unvilling it most cases not a problem to change to another isp that allows it
