diff --git a/build/run/docker-entrypoint/init.d/30-postfix.sh b/build/run/docker-entrypoint/init.d/30-postfix.sh
index 67baa8e..0f65039 100755
--- a/build/run/docker-entrypoint/init.d/30-postfix.sh
+++ b/build/run/docker-entrypoint/init.d/30-postfix.sh
@@ -5,7 +5,7 @@ postconf -e "myhostname = ${MYVEMAIL_SUBDOMAIN}.${MYVEMAIL_DOMAIN}"
 postconf -e "mydomain = ${MYVEMAIL_DOMAIN}"
 
 # resolv.conf
-mkdir /var/spool/postfix/etc
+[ -d /var/spool/postfix/etc/ ] || mkdir /var/spool/postfix/etc/
 cp /etc/resolv.conf /var/spool/postfix/etc/resolv.conf
 
 # Whitelist localhost