diff --git a/site.yaml b/site.yaml
index 0642dde..14b7ec3 100644
--- a/site.yaml
+++ b/site.yaml
@@ -5,3 +5,10 @@ wordmark_invert: false
 wordmark_height: 2.4
 stylesheet: custom.css
 favicon: images/logo.svg
+# Who mail from this site comes from (portal 0.3.43, delivered by gdo
+# on kasse). klingenbergbygg.no is what kasse's postfix may sign and
+# send for today; a post.tomtervel.no sender comes with the vel's own
+# DNS. Replies go to the board's real inbox.
+mail:
+  from: Tomter Vel <tomtervel@klingenbergbygg.no>
+  reply_to: post@tomtervel.no