While sending an email I found some problem with Plugin

Hi techyv,
There is something wrong happening while I want to send email; the problem seems to involve with the plugin.
I already tried to do something with the server, but no result and there is error message “try this action again.
If the problem continues, check the Microsoft Dynamics CRM Community for solutions or contact your organization’s Microsoft Dynamics CRM Administrator.
Finally, you can contact Microsoft Support”. Actually the error happened is not directed in the message”
I am stuck here, anyone can help me to know what I need to do so it can work?
Thank you

