Verizon - Mail Delivery Status Notification (Delay)

Verizon - Mail Delivery Status Notification (Delay)

errors when trying to send to a customer with a Verizon.net email account. Please correct.

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This message was created automatically by mail delivery system.

 

THIS IS A WARNING MESSAGE ONLY.

 

YOU DO NOT NEED TO RESEND YOUR MESSAGE.

 

The original message was received at Fri, 10 Jan 2020 03:54:50 -0800  from xxx@xxx.com

 

    ----- The following addresses had fatal errors -----   

   [Status: Error, Address: <EMAIL>, ResponseCode 421, 4.7.0 [TSS04] Messages from 136.143.188.54 temporarily deferred due to user complaints - 4.16.55.1; see https://help.yahoo.com/kb/postmaster/SLN3434.html]