Email Delays

Email Delays

Hi there,

Recently I've been getting an email saying:

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 Sat, 18 Nov 2017 23:22:39 +0100

 from PRIVATE

 

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

   [Status: Error, Address: <PRIVATE>, ResponseCode 421, 4.7.0 Temporarily Deferred]

 

Message will be retried for 4 more day(s)

 

    ----- Transcript of session follows -----   

 

 Received:from [IPv6:::ffff:192.168.1.68] (67.221.93.209.dyn.plus.net [209.93.221.67]) by mx.zoho.eu

                with SMTPS id 1511041056601758.3423821006386; Sat, 18 Nov 2017 22:37:36 +0100 (CET)

 Date:Sat, 18 Nov 2017 21:37:35 +0000

 From:<support@sessionstyle.com>

 To:"PRIVATE" <PRIVATE>

 Subject:PRIVATE

 Content-Type:multipart/alternative;

                boundary="_D11B87D6-71F9-42DD-AE26-95839EDE1AAD_"


Does this always happen and how can this be fixed??