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A message that you sent could not be delivered to one or more of its
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  cozycritters13@gmail.com
    (ultimately generated from critters.cozy@1stmile.net)
    host gmail-smtp-in.l.google.com [108.177.98.27]
    SMTP error from remote mail server after end of data:
    550-5.7.25 [207.32.205.18] 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. For more information, go to
    550-5.7.25  https://support.google.com/mail/answer/81126#ip-practices
    550-5.7.25 To learn more about Gmail's sender policy, go to
    550 5.7.25  https://support.google.com/mail/answer/81126. a9-20020a170902ecc900b001e08341f80bsi12983662plh.485 - gsmtp