Sendmail requires reverse lookup?

Could someone confirm or deny this: Sendmail won't be able to recieve email from the outside unless the server's name listed in the MX record can be reverse-looked up.

And also confirm or deny: In order to get reverse-lookup working for my mail server, I have to ask my ISP to do it in their DNS, I can't just do that in my own server's DNS.

I'm so bad with email.

 

 

 

 

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