Tickets replyed

Tickets replyed

Hi, 

Every time a client replies to any email sent by manageengine, the reply opens a new ticket, instead of getting into the conversation of the already existing ticket. 
We are in Mexico, so every time someone replies to any email, the subject changes and starts with a "RE : ". 
How can i configure manageengine to recognize a mail being replied and get the information into the existing ticket???

BR
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