(Postmaster) Ticket Update

[tiffany]

I don't know if someone already ask this kind to question, but for now can someone help me to find a way for me to solve my concern,
So here's the thing, I need to look for when an email has arrived in OTRS, how can OTRS automatically include that email on a certain ticket.
For example

ticket#101, when we send an email to OTRS regarding ticket#101, the received email it will automatically go to ticket#101

(this is to avoid recreation of new ticket inside otrs, I just want the email to be an update on a certain ticket inside the otrs.)
Thank you in advance,

[jojo]

thats automatically done via the [Ticket#2015110588000015] hash in the subject

[tiffany]

Thank you jojo