Notification failed to send

Notification failed to send

we are facing constant issue on notification failed when replying a ticket 



Notification failed on sending mail reply to a ticket  

License Info
License Type = Registered
Product = Enterprise

@Name = Temesghen Shama Araia@
@Mobile Number = 50067786@
@Database Name = Microsoft SQL Server@
@Database Version = 12.00.2000@
@Current Build = 9229@
@32 / 64 bit installation = 64@
@Logged in users = 22@
@Zone = Asia/Riyadh@

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