How important are RDNS entries?

I have a server at a hosting company who does not delegate authority over IP's. I've been waiting for 3 weeks for them to add RDNS PTR entries for my IP's, but they're still not added/reverse resolving correctly How important are RDNS entries? How important are RDNS entries? How important are RDNS entries?

How important is this? What major ISP's might bounce mail, etc. if my IP's do not have proper RDNS entries setup?

 

 

 

 

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