diff --git a/conservancy/usethesource/emails.py b/conservancy/usethesource/emails.py
new file mode 100644
index 0000000000000000000000000000000000000000..8fde9d6f261dfae3fe48bca30c86f2550ea385ed
--- /dev/null
+++ b/conservancy/usethesource/emails.py
@@ -0,0 +1,15 @@
+from django.core.mail import EmailMessage
+
+
+def make_comment_email(comment):
+    subject = f'Re: {comment.candidate.name}'
+    signature = comment.user.get_full_name() or comment.user.username
+    sender = f'{signature} <compliance@sfconservancy.org>'
+    to = ['nutbush@lists.sfconservancy.org']
+    body = f'{comment.message}\n\n--\n{signature}'
+    headers = {'Message-ID': comment.email_message_id}
+    if in_reply_to := comment.in_reply_to():
+        # From my testing, both "In-Reply-To" and "References" headers trigger
+        # email threading in Thunderbind. Sticking to "In-Reply-To" for now.
+        headers['In-Reply-To'] = in_reply_to
+    return EmailMessage(subject, body, sender, to, headers=headers)