canvas-lms/app/messages/announcement_reply.email.erb

<% define_content :link do %>
  <%= polymorphic_url([asset.context, :discussion_topic], id: asset.discussion_topic_id, anchor: "entry-#{asset.id}") %>
<% end %>

<% define_content :subject do %>
  <%= t :subject, "New Comment on Announcement %{discussion_topic}: %{course}", :discussion_topic => asset.title, :course => asset.context.name %>
<% end %>

<%= t :body, "%{user} posted a new comment on the announcement: %{discussion_topic} for %{course}:", :user => asset.user.short_name, :discussion_topic => asset.title, :course => asset.context.name %>

<%= html_to_text(asset.message, :base_url => dashboard_url) %>

<%= t("Comment by replying to this message, or join the conversation using this link: %{link}.", link: content(:link)) %>