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<erickpecots@gmail.com>: host gmail-smtp-in.l.google.com[108.177.112.27] said:
    550-5.7.1 [74.208.41.59] The IP address sending this message does not have
    a PTR 550-5.7.1 record setup. As a policy, Gmail does not accept messages
    from IPs 550-5.7.1 with missing PTR records. Please visit 550-5.7.1
    https://support.google.com/mail/answer/81126#authentication for more 550
    5.7.1 information. p1si12051002jaj.114 - gsmtp (in reply to end of DATA
    command)
Reporting-MTA: dns; grupoibarra.com.mx
X-Postfix-Queue-ID: 1A4E96097D
X-Postfix-Sender: rfc822; erickp@gruasibarra.com.mx
Arrival-Date: Wed,  5 Dec 2018 18:04:49 -0600 (CST)

Final-Recipient: rfc822; erickpecots@gmail.com
Original-Recipient: rfc822;erickpecots@gmail.com
Action: failed
Status: 5.7.1
Remote-MTA: dns; gmail-smtp-in.l.google.com
Diagnostic-Code: smtp; 550-5.7.1 [74.208.41.59] The IP address sending this
    message does not have a PTR 550-5.7.1 record setup. As a policy, Gmail does
    not accept messages from IPs 550-5.7.1 with missing PTR records. Please
    visit 550-5.7.1
    https://support.google.com/mail/answer/81126#authentication for more 550
    5.7.1 information. p1si12051002jaj.114 - gsmtp