Replying to an ad on Gumtree is totally free!

To reply to the person that posted an ad, enter your email address and a message in the "Email poster" box found on the right-hand side of the ad:
 

 

 

Once you send your message, the poster of the ad will get an email with your reply. The poster will now be able to email you directly. Please note that you have to be registered to reply to an ad on Gumtree.