Sonic.net

I'm getting bounces when sending e-mail to someone using secureserver.net, looks like a similar problem to one about e-mailing earthlink. What is the fix?

From: Mail Delivery Subsystem <[email protected]>
Subject: Returned mail: see transcript for details
Date: August 6, 2014 at 8:06:03 PM PDT
To: <[email protected]>

The original message was received at Wed, 6 Aug 2014 20:05:59 -0700
from c-67-188-5-93.hsd1.ca.comcast.net [67.188.5.93]

----- The following addresses had permanent fatal errors -----
<[email protected]>
(reason: 554 p3plibsmtp03-15.prod.phx3.secureserver.net bizsmtp 64.142.111.50 has been blocked for the day, for attempting to mail too many invalid recipients. IB113 <http://x.co/rlbounce>)

----- Transcript of session follows -----
... while talking to smtp.secureserver.net.:
<<< 554 p3plibsmtp03-11.prod.phx3.secureserver.net bizsmtp 64.142.111.50 has been blocked for the day, for attempting to mail too many invalid recipients. IB113 <http://x.co/rlbounce>
... while talking to mailstore1.secureserver.net.:
<<< 554 p3plibsmtp03-15.prod.phx3.secureserver.net bizsmtp 64.142.111.50 has been blocked for the day, for attempting to mail too many invalid recipients. IB113 <http://x.co/rlbounce>
554 5.0.0 Service unavailable
Reporting-MTA: dns; d.mail.sonic.net
Received-From-MTA: DNS; c-67-188-5-93.hsd1.ca.comcast.net
Arrival-Date: Wed, 6 Aug 2014 20:05:59 -0700

Final-Recipient: RFC822; [email protected]
Action: failed
Status: 5.5.0
Diagnostic-Code: SMTP; 554 p3plibsmtp03-15.prod.phx3.secureserver.net bizsmtp 64.142.111.50 has been blocked for the day, for attempting to mail too many invalid recipients. IB113 <http://x.co/rlbounce>
Last-Attempt-Date: Wed, 6 Aug 2014 20:06:03 -0700

Kev, this should be resolved now.

Perhaps not resolved: Here is a message I received re/ a recipient in Switzerland:
>>
The original message was received at Thu, 19 Mar 2015 06:18:14 -0700
from 173-228-83-180.dsl.dynamic.fusionbroadband.com [173.228.83.180]

----- The following addresses had permanent fatal errors -----
<[email protected]>
(reason: 451 Connection not accepted from blacklisted IP address [64.142.111.50])

----- Transcript of session follows -----
<[email protected]>... Deferred
Message could not be delivered for 5 days
Message will be deleted from queue<<