Redmine/app/views/mailer/_issue.text.erb

<%= "#{issue.tracker.name} ##{issue.id}: #{issue.subject}" %>
<%= issue_url %>

* <%=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_field_values.each do |c| %>* <%= c.custom_field.name %>: <%= show_value(c) %>
<% end -%>
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<%= issue.description %>