How to set up PTR (reverse DNS) records in my domain?

I can’t send mail on some mail srvices without RTP. I checked my code, it works. mails are reciving by gmail, but for example mail.ru doesn’t work. is There any way to send mail from free host to mail services wich require RTP?

Just check online scripts, you should find some that can achieve that.

im sorry. misspelled. i mean PTR or revers DNS.