Undelivered Mail Returned to Sender

Undelivered Mail Returned to Sender

Dear team,

Today i have this isuss.
i still can recive few mails. 
i canot send mail or recive mail of others 
please help

This message was created automatically by mail delivery software.
A message that you sent could not be delivered to one or more of its recipients. This is a permanent error.

quocthang.ttt@gmail.com, ERROR CODE :550 - 5.7.26 The MAIL FROM domain [cokhitranthanhthuy.com] has an SPF record with
            5.7.26 a hard fail policy (-all) but it fails to pass SPF checks with the
            5.7.26 ip: [136.143.188.50]. To best protect our users from spam and
            5.7.26 phishing, the message has been blocked. Please visit
            5.7.26 https://support.google.com/mail/answer/81126#authentication for more
            5.7.26 information. p10-20020a17090a930a00b00240d56569eesi683503pjo.166 - gsmtp



Reporting-MTA: dns; mx.zohomail.com
Arrival-Date: Thu, 13 Apr 2023 10:10:16 +0700

Original-Recipient: rfc822; quocthang.ttt@gmail.com
Final-Recipient: rfc822; quocthang.ttt@gmail.com
Status: 550
Action: failed
Last-Attempt-Date: 13 Apr 2023 03:10:20 GMT
Diagnostic-Code: 5.7.26 The MAIL FROM domain [cokhitranthanhthuy.com] has an SPF record with
            5.7.26 a hard fail policy (-all) but it fails to pass SPF checks with the
            5.7.26 ip: [136.143.188.50]. To best protect our users from spam and
            5.7.26 phishing, the message has been blocked. Please visit
            5.7.26 https://support.google.com/mail/answer/81126#authentication for more
            5.7.26 information. p10-20020a17090a930a00b00240d56569eesi683503pjo.166 - gsmtp


Received:from mail.zoho.com by mx.zohomail.com
    with SMTP id 1681355416644495.6919234715921; Wed, 12 Apr 2023 20:10:16 -0700 (PDT)
Message-ID:<1877897a42d.11e954f9d287380.7035768319883228713@cokhittt.com>
Date:Thu, 13 Apr 2023 10:10:16 +0700
From:COKHITTT <Quocthang@cokhittt.com>

Subject:=?UTF-8?B?w6I=?=
Content-Type:multipart/alternative;
    boundary="----=_Part_910574_1765711174.1681355416621"
User-Agent:Zoho Mail