In Retry Queue Temporary failure when delivering email to the recipients. Emails in queue will be retried automatically.

In Retry Queue Temporary failure when delivering email to the recipients. Emails in queue will be retried automatically.

Hello Team,
I see the emails in the sent folder. But they are getting delivered to the recipient. 
The message I see is "

In Retry Queue

Temporary failure when delivering email to the recipients. Emails in queue will be retried automatically."

Please advise.

Thanks,
Kiran Kumar