host gmail-smtp-in l google com [XXX]
SMTP error from remote mail server after end of data:
550-5.7.25 [XXX] The IP address sending this message does not have a
550-5.7.25 PTR record setup, or the corresponding forward DNS entry does not
550-5.7.25 point to the sending IP. As a policy, Gmail does not accept messages
550-5.7.25 from IPs with missing PTR records. Please visit
550-5.7.25 XXXXXXXXXX for more
550 5.7.25 information. XXX - gsmtp
Welcome to the Cloudflare Community. 
You will need to consult your email service provider as only they can assist with this matter. PTR records can only be configured by the party that manages the IP allocation.
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