How to respond to mail?

I’ve received message from the buyer which was sent via my profile form on ThemeForest and once I responded I’ve got automation message like on the message bellow

Now I have no other way of contacting this buyer since envato does not add message box to buyer accounts, he can think that I will not respond to him and maybe give low rating and to communicate with envato it takes days for them to respond. I do not want to click on these spam links.

Now these are the moments when you need contact form for the buyer as well.

What to do?