Unable to configure Mailu to reject instead of bounce

[xudonax]

I'm having a spam issue in that I'm getting ~250.000 spam mails and mailu is bouncing them all. This got me on some spam lists so I'm looking into sending a reject to the server that's sending them to me instead of sending a bounce to the FROM address. As far as I can see this is not (yet) configurable. How would I do this?

At the moment my logs are littered with messages like smtp_1 | 2018-08-22T07:30:18.130405545Z postfix/smtp[137]: 73EBC8B09: to=<some-random-address@yahoo.com.tw>, relay=mx-tw.mail.gm0.yahoodns.net[180.222.103.9]:25, delay=29, delays=17/0.03/12/0.24, dsn=4.7.0, status=deferred (host mx-tw.mail.gm0.yahoodns.net[180.222.103.9] said: 421 4.7.0 [TSS04] Messages from 94.142.240.35 temporarily deferred due to user complaints - 4.16.55.1; see https://help.yahoo.com/kb/postmaster/SLN3434.html (in reply to MAIL FROM command)) which lead me to believe this is a bounce message being sent. The domain yahoo.com.tw is not in my configuration and I'm certainly not trying to send mails there.

[xudonax]

This seems to be fixed by adding -o smtpd_reject_unlisted_recipient=yes to the master.cf file at line 10, making the file look like this:

# service type  private unpriv  chroot  wakeup  maxproc command + args
#               (yes)   (yes)   (yes)   (never) (100)

# Exposed SMTP service
smtp      inet  n       -       n       -       -       smtpd

# Internal SMTP service
10025     inet  n       -       n       -       -       smtpd
  -o smtpd_sasl_auth_enable=yes
  -o smtpd_recipient_restrictions=reject_unlisted_sender,reject_sender_login_mismatch,permit
  -o smtpd_reject_unlisted_recipient=yes
  -o cleanup_service_name=outclean
outclean  unix n       -       n       -       0       cleanup
  -o header_checks=pcre:/etc/postfix/outclean_header_filter.cf

# Internal postfix services
pickup    unix  n       -       n       60      1       pickup
cleanup   unix  n       -       n       -       0       cleanup
qmgr      unix  n       -       n       300     1       qmgr
tlsmgr    unix  -       -       n       1000?   1       tlsmgr
rewrite   unix  -       -       n       -       -       trivial-rewrite
bounce    unix  -       -       n       -       0       bounce
defer     unix  -       -       n       -       0       bounce
trace     unix  -       -       n       -       0       bounce
verify    unix  -       -       n       -       1       verify
flush     unix  n       -       n       1000?   0       flush
proxymap  unix  -       -       n       -       -       proxymap
smtp      unix  -       -       n       -       -       smtp
relay     unix  -       -       n       -       -       smtp
error     unix  -       -       n       -       -       error
retry     unix  -       -       n       -       -       error
discard   unix  -       -       n       -       -       discard
lmtp      unix  -       -       n       -       -       lmtp
anvil     unix  -       -       n       -       1       anvil
scache    unix  -       -       n       -       1       scache

[ofthesun9]

Closed with #626