diff --git a/docker-compose.yml b/docker-compose.yml
index efc3bb8..0b141f8 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -40,6 +40,7 @@ services:
     ports:
       - 143:143 # dovecot imap
       - 993:993 # dovecot imaps
+      - 25:25 # postfix smtp
       - 465:465 # postfix smtps
       - 587:587 # postfix submission
     volumes:
diff --git a/mail/etc/postfix/master.cf b/mail/etc/postfix/master.cf
index 7a3161e..1151ab8 100644
--- a/mail/etc/postfix/master.cf
+++ b/mail/etc/postfix/master.cf
@@ -8,7 +8,7 @@
 # service type  private unpriv  chroot  wakeup  maxproc command + args
 #               (yes)   (yes)   (yes)   (never) (100)
 # ==========================================================================
-#smtp       inet  n       -       y       -       -       smtpd
+smtp       inet  n       -       y       -       -       smtpd
 #  -o milter_macro_daemon_name=ORIGINATING
 #  -o smtpd_client_restrictions=permit_sasl_authenticated,reject
 #  -o smtpd_relay_restrictions=permit_mynetworks,permit_sasl_authenticated,reject