--- master.cf.ori	2021-08-20 02:16:35.192277663 +0200
+++ master.cf	2021-08-20 02:25:29.161747244 +0200
@@ -9,7 +9,8 @@
 # service type  private unpriv  chroot  wakeup  maxproc command + args
 #               (yes)   (yes)   (no)    (never) (100)
 # ==========================================================================
-smtp      inet  n       -       y       -       -       smtpd
+#smtp      inet  n       -       y       -       -       smtpd
+localhost:smtp inet n   -       y       -       -       smtpd
 #smtp      inet  n       -       y       -       1       postscreen
 #smtpd     pass  -       -       y       -       -       smtpd
 #dnsblog   unix  -       -       y       -       0       dnsblog
@@ -81,45 +82,3 @@
 maildrop  unix  -       n       n       -       -       pipe
   flags=DRXhu user=vmail argv=/usr/bin/maildrop -d ${recipient}
 #
-# ====================================================================
-#
-# Recent Cyrus versions can use the existing "lmtp" master.cf entry.
-#
-# Specify in cyrus.conf:
-#   lmtp    cmd="lmtpd -a" listen="localhost:lmtp" proto=tcp4
-#
-# Specify in main.cf one or more of the following:
-#  mailbox_transport = lmtp:inet:localhost
-#  virtual_transport = lmtp:inet:localhost
-#
-# ====================================================================
-#
-# Cyrus 2.1.5 (Amos Gouaux)
-# Also specify in main.cf: cyrus_destination_recipient_limit=1
-#
-#cyrus     unix  -       n       n       -       -       pipe
-#  flags=DRX user=cyrus argv=/cyrus/bin/deliver -e -r ${sender} -m ${extension} ${user}
-#
-# ====================================================================
-# Old example of delivery via Cyrus.
-#
-#old-cyrus unix  -       n       n       -       -       pipe
-#  flags=R user=cyrus argv=/cyrus/bin/deliver -e -m ${extension} ${user}
-#
-# ====================================================================
-#
-# See the Postfix UUCP_README file for configuration details.
-#
-uucp      unix  -       n       n       -       -       pipe
-  flags=Fqhu user=uucp argv=uux -r -n -z -a$sender - $nexthop!rmail ($recipient)
-#
-# Other external delivery methods.
-#
-ifmail    unix  -       n       n       -       -       pipe
-  flags=F user=ftn argv=/usr/lib/ifmail/ifmail -r $nexthop ($recipient)
-bsmtp     unix  -       n       n       -       -       pipe
-  flags=Fq. user=bsmtp argv=/usr/lib/bsmtp/bsmtp -t$nexthop -f$sender $recipient
-scalemail-backend unix -       n       n       -       2       pipe
-  flags=R user=scalemail argv=/usr/lib/scalemail/bin/scalemail-store ${nexthop} ${user} ${extension}
-mailman   unix  -       n       n       -       -       pipe
-  flags=FRX user=list argv=/usr/lib/mailman/bin/postfix-to-mailman.py ${nexthop} ${user}