format as link to email address, ruby on rails -

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the <%= @post.source_account %> email address. want display link says "email me" , when click open users mail client 

 <% if @post.source_account.present? %>           <h4>email seller: <small> <%= @post.source_account %><br></h4>           <% end %>

you can use mail_to, creates mailto link tag specified email address:

<%= mail_to @post.source_account, "email me" %>

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