Quiet why did our outbound router need a reverse dns entry ? to send email to a shit consumer grade isp selling tv , it (the router) does not send email and the mail hosts (plural) do have reverse dns.
Cable tv companies hate email.
Anyhow that is a reason why you do not your isp’s email (my blog) – should you need another reason.
I made a dns record and got a ptr to it so i wonder what other stupid bullshit they think you need to send email.
Anyhow stupid is as stupid does (not here) in cable tv land is that correct Mr Branson*.
*who cannot run a train franchise, or space company as well.