Warning: message delayed 24 hours? How to fix it?

From: Mail Delivery System <[email protected]>
This message was created automatically by mail delivery software.
A message that you sent has not yet been delivered to one or more of its recipients after more than 24 hours on the queue on server.example.com.

The message identifier is: 1ciHMT-0006c3-4y
The subject of the message is: RE: My answers to your questions
The date of the message is: Mon, 27 Feb 2017 16:12:47 +0700

The addresses to which the message has not yet been delivered are:

[email protected]
host mta6.am0.yahoodns.net [98.136.216.26]
Delay reason: SMTP error from remote mail server after pipelined MAIL FROM:<[email protected]> SIZE=214844:
421 4.7.0 [TSS04] Messages from MY_IP_ADDRESS temporarily deferred due to user complaints - 4.16.55.1; see https://help.yahoo.com/kb/postmaster/SLN3434.html
[email protected]
host mta5.am0.yahoodns.net [98.136.217.203]
Delay reason: SMTP error from remote mail server after pipelined MAIL FROM:<[email protected]> SIZE=214844:
421 4.7.0 [TSS04] Messages from MY_IP_ADDRESS temporarily deferred due to user complaints - 4.16.55.1; see https://help.yahoo.com/kb/postmaster/SLN3434.html
[email protected]

No action is required on your part. Delivery attempts will continue for some time, and this warning may be repeated at intervals if the message remains undelivered. Eventually the mail delivery software will give up, and when that happens, the message will be returned to you.

Click to expand...

Reporting-MTA: dns; server.xxxxxx.com

Action: delayed
Final-Recipient: rfc822;[email protected]
Status: 4.0.0
Remote-MTA: dns; alt4.gmail-smtp-in.l.google.com
Diagnostic-Code: smtp; 421-4.7.0 [MY_IP_ADDRESS 15] Our system has detected an unusual rate of
421-4.7.0 unsolicited mail originating from your IP address. To protect our
421-4.7.0 users from spam, mail sent from your IP address has been temporarily
421-4.7.0 rate limited. Please visit
421-4.7.0 https://support.google.com/mail/?p=UnsolicitedRateLimitError to
421 4.7.0 review our Bulk Email Senders Guidelines. k188si16652286wma.76 - gsmtp

Action: delayed
Final-Recipient: rfc822;[email protected]
Status: 4.0.0
Remote-MTA: dns; mta6.am0.yahoodns.net
Diagnostic-Code: smtp; 421 4.7.0 [TSS04] Messages from MY_IP_ADDRESS temporarily deferred due to user complaints - 4.16.55.1; see https://help.yahoo.com/kb/postmaster/SLN3434.html

Click to expand...