Wordpress one click install is not sending any mails such as forgot passwords.

Posted October 6, 2017 2.6k views
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I need step by step instruction to fix this error. I found two files in the /var/mail folder. root and www-data. When I opened them, the messages contain some information as follows.

The original message was received at Thu, 5 Oct 2017 03:33:58 GMT
from localhost []

—– The following addresses had permanent fatal errors —–
(reason: 550-5.7.1 [ 1] Our system has detected an unusual rate of)

—– Transcript of session follows —–
… while talking to

<<< 550-5.7.1 [ 1] Our system has detected an unusual rate of
<<< 550-5.7.1 unsolicited mail originating from your IP address. To protect our
<<< 550-5.7.1 users from spam, mail sent from your IP address has been blocked.
<<< 550-5.7.1 Please visit
<<< 550-5.7.1 to review our
<<< 550 5.7.1 Bulk Email Senders Guidelines. a65si236585pgc.201 - gsmtp
554 5.0.0 Service unavailable

Content-Type: message/delivery-status

Reporting-MTA: dns; wordpress-1gb-sgp1-01
Received-From-MTA: DNS; localhost
Arrival-Date: Thu, 5 Oct 2017 03:33:58 GMT

Final-Recipient: RFC822;
Action: failed
Status: 5.7.1
Remote-MTA: DNS;
Diagnostic-Code: SMTP; 550-5.7.1 [ 1] Our system has detected an unusual rate of
Last-Attempt-Date: Thu, 5 Oct 2017 03:36:00 GMT

Content-Type: text/rfc822-headers

Return-Path: www-data@wordpress-1gb-sgp1-01
Received: from wordpress-1gb-sgp1-01 (localhost [])
by wordpress-1gb-sgp1-01 (8.15.2/8.15.2/Debian-3) with ESMTP id v953XwqK031346
for; Thu, 5 Oct 2017 03:33:58 GMT
Received: (from www-data@localhost)
by wordpress-1gb-sgp1-01 (8.15.2/8.15.2/Submit) id v953XwCo031338;
Thu, 5 Oct 2017 03:33:58 GMT
Subject: =?UTF-8?B?W+GAseGAnOGAt+GAnOGArF0gUGFzc3dvcmQgUmVzZXQ=?=
X-PHP-Originating-Script: 33:class-phpmailer.php
Date: Thu, 5 Oct 2017 03:32:58 +0000
From: WordPress wordpress@localhost.localdomain
X-Mailer: PHPMailer 5.2.22 (
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8

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Your server is being blocked by Gmail because of spammy looking email. Try this form to unblock it: