Why I keep receiving this message?

Hi
I have used MailEnable for my hosting email service. Why I keep receving the following message when email sent?
This happens to different email account I sent. I received this message around 4 of 10 emails sent.


Thank you.
------------------------------------------------------------------
MailEnable: Message delivery has been delayed.

Message is waiting at xxxx.com for delivery to xxxx.com.

Reason: Mail Server for xxxx.com could not be contacted at this time. MailEnable will keep trying to deliver this message and will notify you of any progress.

 

 

 

 

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