Redmine/app/views/mailer/_issue_text_plain.rhtml

<%= "#{issue.tracker.name} ##{issue.id}: #{issue.subject}" %>
<%= url_for :only_path => false, :host => Setting.host_name, :controller => 'issues', :action => 'show', :id => issue %>

<%=l(:field_author)%>: <%= issue.author %>
<%=l(:field_status)%>: <%= issue.status %>
<%=l(:field_priority)%>: <%= issue.priority %>
<%=l(:field_assigned_to)%>: <%= issue.assigned_to %>
<%=l(:field_category)%>: <%= issue.category %>
<%=l(:field_fixed_version)%>: <%= issue.fixed_version %>
<% issue.custom_values.each do |c| %><%= c.custom_field.name %>: <%= show_value(c) %>
<% end %>

<%= issue.description %>