diff --git a/HowtoOpenDKIM.md b/HowtoOpenDKIM.md
index 729a9bbf..c5ae6f88 100644
--- a/HowtoOpenDKIM.md
+++ b/HowtoOpenDKIM.md
@@ -81,6 +81,7 @@ OversignHeaders         From
 #DisableADSP             true
 Socket                  inet:8891@localhost
 PidFile                 /var/run/opendkim/opendkim.pid
+RemoveOldSignatures     yes
 
 # Liste les IPs des serveurs SMTP internes pour lesquels OpenDKIM va signer les mails
 InternalHosts           refile:/etc/opendkim/hosts_whitelist
@@ -138,6 +139,7 @@ OversignHeaders         From
 #DisableADSP             true
 Socket                  inet:8891@localhost
 PidFile                 /var/run/opendkim/opendkim.pid
+RemoveOldSignatures     yes
 
 KeyTable                refile:/etc/opendkim/KeyTable
 SigningTable            refile:/etc/opendkim/SigningTable