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

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

DATA <<< 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

–v953a0qK031348.1507174560/wordpress-1gb-sgp1-01 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

–v953a0qK031348.1507174560/wordpress-1gb-sgp1-01 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 To: 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 Message-ID: X-Mailer: PHPMailer 5.2.22 ( MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8

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