diff --git a/plinth/modules/email_server/data/etc/dovecot/conf.d/90-freedombox-lmtp.conf b/plinth/modules/email_server/data/etc/dovecot/conf.d/90-freedombox-lmtp.conf
index a0f2a3ca4..0b9c3516f 100644
--- a/plinth/modules/email_server/data/etc/dovecot/conf.d/90-freedombox-lmtp.conf
+++ b/plinth/modules/email_server/data/etc/dovecot/conf.d/90-freedombox-lmtp.conf
@@ -1,6 +1,10 @@
 # Direct edits to this file will be lost!
 # Manage your settings on Plinth <https://localhost/plinth/apps/email_server>
 
+# Privacy: remove the recipient's UID number from email headers
+lmtp_add_received_header = no
+lmtp_hdr_delivery_address = original
+
 protocol lmtp {
   mail_plugins = $mail_plugins sieve
 }