earthlink email problems

[jimmy keffer <horsezip () earthlink net>]

my has problems sending mail to earthlink.net the sever has a ptr abd
reverse dns set but i get this To: jimmy () horsezipsworld com
Subject: Message undeliverable: MegaBBS Forum horsezip's world : New
user alert
From: mailer-daemon () horsezipsworld com
Date: Sun, 20 May 2018 23:40:41 -0400

Your message did not reach some or all of the intended recipients.

   Sent: Sun, 20 May 2018 23:40:40 -0400
   Subject: MegaBBS Forum horsezip's world : New user alert

The following recipient(s) could not be reached:

horsezip () earthlink net
   Error Type: SMTP
   Remote server (209.86.93.228) issued an error.
   hMailServer sent: MAIL FROM:<jimmy () horsezipsworld com>
   Remote server replied: 550 ERROR: No or mismatched reverse DNS (PTR)
entries for 23.227.197.10



hMailServer

any one here who can help my server sends mail to servers fine gmail etc
jimmy