550 Junk mail rejected gmail #company .com - email

Good afternoon.
I have the following issue
When I send from example#gmail.com to other gmails or company mails working properly.
But when I try from example#gmail.com to send to example#company.com I receive the following error
550 "JunkMail rejected - mail-yb1-f181.google.com [209.85.219.181]:40242 is in an RBL: "
If I send from another example_1#gmail.com to example#company.com working properly.
I check if the Ip is blacklisted but is not.
What I should try? Please help

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