1 files changed, 5 insertions, 0 deletions
diff --git a/src/smtp.c b/src/smtp.c
index ed70519..6a90424 100644
--- a/src/smtp.c
+++ b/src/smtp.c
@@ -751,6 +751,11 @@ static int build_message(const struct smtp_message *m, const char *from,
     }
     buf_appendf(out, "<%s>\r\n", from);
     buf_appendf(out, "To: <%s>\r\n", to);
+    if (m->reply_to && m->reply_to[0]) {
+        char *rt = sanitize_dup(m->reply_to);
+        buf_appendf(out, "Reply-To: <%s>\r\n", rt);
+        free(rt);
+    }
 
     char *subject = sanitize_dup(m->subject ? m->subject : "");
     buf_append_str(out, "Subject: ");