replace all newline chars with a whitespace

utils.py

@@ -68,4 +68,7 @@ def make_email_link(
     # strip brackets and other HTML-tag characters from body with regex
     body = re.sub(r"<[^>]*>", tag_placeholder, body)
 
+    # replace all newline chars with a whitespace
+    body = body.replace("\n", " ")
+
     return f'<a href="mailto:%20?subject={subject}&body={body}">{link_text}</a>'