Setting up a PTR record in BIND

I run Postfix and I need my server's public IP address to be resolving to
I know that we have a PTR record for that AKA rDNS.
It's all nice, but something confuses me here. I know that there's a way (somewhat complicated though) to set up a PTR record in BIND. I think there' s a separate file for that etc. But that's not my question here. I know that some people apply to their ISP so that the ISP would set up the correct hostname for the IP that it's lending to its customer. So that some picky SMTP servers out there will accept the mail that's being sent to them.
My question is:
What's the right way to do it and what's the difference between setting up a PTR in BIND configuration yourself and asking your ISP to do it for you. To me it sounds like a contradiction.
Who is Participating?

[Product update] Infrastructure Analysis Tool is now available with Business Accounts.Learn More

I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

Mal OsborneAlpha GeekCommented:
The PTR record is for the IP address, not the domain. A such, it needs to be set up in the DNS server authoritative for that IP block. This will nearly always be your ISP.

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Email Servers

From novice to tech pro — start learning today.