Hello list
Why does Postfix accept a mail to a non-existing account on the local system?
Here my /etc/postfix/main.cf, Version 1:
[...]
myhostname = sv1.example.org
[...]
mydestination = sv1.example.org, localhost.localdomain, localhost
[...]
Talking to my server:
$ telnet $IP smtp
Trying $IP...
Connected to $IP.
Escape character is '^]'.
220 sv1.example.org ESMTP Postfix (Debian/GNU)
helo ich
250 sv1.example.org
mail from:$EMAIL
250 2.1.0 Ok
rcpt to:bot...@example.org
454 4.7.1 <bot...@example.org>: Relay access denied
rcpt to:bot...@sv1.example.org
550 5.1.1 <bot...@sv1.example.org>: Recipient address rejected: User unknown in
local recipient table
quit
221 2.0.0 Bye
Connection closed by foreign host.
I want to accept mails for example.org too, so let's change mail.cf, removing
the "sv1." in mydestination, here Version 2:
[...]
myhostname = sv1.example.org
[...]
mydestination = example.org, localhost.localdomain, localhost
[...]
and try it again:
$ telnet $IP smtp
Trying $IP...
Connected to $IP.
Escape character is '^]'.
220 sv1.example.org ESMTP Postfix (Debian/GNU)
helo ich
250 sv1.example.org
mail from:$EMAIL
250 2.1.0 Ok
rcpt to:bot...@example.org
550 5.1.1 <bot...@example.org>: Recipient address rejected: User unknown in
local recipient table
rcpt to:bot...@sv1.example.org
250 2.1.5 Ok
So, "bot...@example.org" is now accepted as valid (but account missing, that's
fine) but why in the hell is Postfix accepting mails for sv1.example.org (which
then in turn will immediately bounce)? The problem I see here is mailer daemon
spam.
Removing the srv1 in myhostname too doesn't help either, same result as in
Version 2, here is my full /etc/postfix/main.cf in Version 3:
Regards, Bodo
# See /usr/share/postfix/main.cf.dist for a commented, more complete version
# Debian specific: Specifying a file name will cause the first
# line of that file to be used as the name. The Debian default
# is /etc/mailname.
#myorigin = /etc/mailname
smtpd_banner = $myhostname ESMTP $mail_name (Debian/GNU)
biff = no
# appending .domain is the MUA's job.
append_dot_mydomain = no
# Uncomment the next line to generate "delayed mail" warnings
#delay_warning_time = 4h
readme_directory = no
# TLS parameters
smtpd_tls_cert_file=/etc/ssl/certs/ssl-cert-snakeoil.pem
smtpd_tls_key_file=/etc/ssl/private/ssl-cert-snakeoil.key
smtpd_use_tls=yes
smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache
smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache
# See /usr/share/doc/postfix/TLS_README.gz in the postfix-doc package for
# information on enabling SSL in the smtp client.
smtpd_relay_restrictions = permit_mynetworks permit_sasl_authenticated
defer_unauth_destination
myhostname = example.org
alias_maps = hash:/etc/aliases
alias_database = hash:/etc/aliases
myorigin = /etc/mailname
mydestination = example.org, localhost.localdomain, localhost
relayhost =
mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128
mailbox_size_limit = 0
recipient_delimiter = +
inet_interfaces = all
