Ticket opened by e-mail

Ticket opened by e-mail

Dears,

Is it possible to avoid customers receive the replay thru e-mail? I mean, I would like to "force" customers to use web customer portal instead of re-open a ticket thru e-mail (even though it has been opened via e-mail for the first time). Customers always would receive a notification when a ticket was replied with a link to access customer portal. 

Thank you in advance for your support.

Regards,

Sidney