diff --git a/app/views/submitter_mailer/_custom_content.html.erb b/app/views/submitter_mailer/_custom_content.html.erb
index 275ec3e4..223ba82e 100644
--- a/app/views/submitter_mailer/_custom_content.html.erb
+++ b/app/views/submitter_mailer/_custom_content.html.erb
@@ -1 +1 @@
-<%= auto_link(simple_format(h(ReplaceEmailVariables.call(local_assigns[:content], submitter: local_assigns[:submitter], sig: local_assigns[:sig])))) %>
+<%= auto_link(simple_format(MarkdownToHtml.call(h(ReplaceEmailVariables.call(local_assigns[:content], submitter: local_assigns[:submitter], sig: local_assigns[:sig]))))) %>
diff --git a/lib/markdown_to_html.rb b/lib/markdown_to_html.rb
new file mode 100644
index 00000000..c66b88b1
--- /dev/null
+++ b/lib/markdown_to_html.rb
@@ -0,0 +1,12 @@
+# frozen_string_literal: true
+
+module MarkdownToHtml
+  LINK_REGEXP = %r{\[([^\]]+)\]\((https?://[^)]+)\)}
+  LINK_REPLACE = '<a href="\2">\1</a>'
+
+  module_function
+
+  def call(text)
+    text.gsub(LINK_REGEXP, LINK_REPLACE)
+  end
+end