Hi,
I've posted this as a serverfault [1]question but had no bites so far.
I am receiving about 50 rejected emails per day because there is a typo
in the sending email address and it's hitting
reject_unknown_sender_domain:
Jul 10 12:21:31 serverb3 postfix/smtpd[6647]: NOQUEUE: reject: RCPT from
smtp.correctly-spelt-domain.co.uk[X.X.X.X]: 450 4.1.8
<em...@mis-spelt-domain.co.uk>: Sender address rejected: Domain not
found; from=<em...@mis-spelt-domain.co.uk> to=<em...@mydomain.co.uk>
proto=ESMTP helo=<smtp.correctly-spelt-domain.co.uk>
I've added em...@mispelt-domain.co.uk OK to /etc/postfix/sender_access,
ran postmap /etc/postfix/sender_access and restarted postfix.
Despite check_sender_access hash:/etc/postfix/sender_access appearing in
my smtpd_recipient_restrictions list before reject_unknown_sender_domain
the emails are still being rejected for that reason. Why is this and how
can I fix it?
Postfix v2.11.3
Output of postconf -n:
alias_database = hash:/etc/aliases
alias_maps = hash:/etc/aliases
biff = no
command_directory = /usr/sbin
config_directory = /etc/postfix
daemon_directory = /usr/lib/postfix
disable_vrfy_command = yes
home_mailbox = Mail/
mailbox_command = /usr/lib/dovecot/deliver
mailbox_size_limit = 0
message_size_limit = 20480000
mydestination = b3.localdomain, localhost.localdomain, localhost,
/etc/postfix/bubbadomains, $myhostname
mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128
recipient_delimiter = +
relayhost = smtp.gmail.com
sender_bcc_maps = hash:/etc/postfix/sender_bcc
smtp_sasl_auth_enable = yes
smtp_sasl_password_maps = hash:/etc/postfix/sasl_passwd
smtp_sasl_security_options = noanonymous
smtp_tls_session_cache_database = btree:${queue_directory}/smtp_scache
smtp_use_tls = yes
smtpd_banner = $myhostname ESMTP $mail_name (Debian/GNU)
smtpd_helo_required = yes
smtpd_recipient_restrictions = permit_mynetworks check_sender_access
hash:/etc/postfix/sender_access reject_unauth_destination
reject_unauth_pipelining reject_invalid_hostname reject_non_fqdn_sender
reject_unknown_sender_domain reject_non_fqdn_recipient
reject_unknown_recipient_domain reject_rbl_client bl.spamcop.net
reject_rbl_client zen.spamhaus.org reject_rbl_client dul.dnsbl.sorbs.net
permit
smtpd_reject_unlisted_sender = yes
smtpd_relay_restrictions = permit_mynetworks reject_unauth_destination
reject_unauth_pipelining reject_invalid_hostname reject_non_fqdn_sender
reject_unknown_sender_domain reject_non_fqdn_recipient
reject_unknown_recipient_domain check_sender_access
hash:/etc/postfix/sender_access reject_rbl_client bl.spamcop.net
reject_rbl_client zen.spamhaus.org reject_rbl_client dul.dnsbl.sorbs.net
permit
smtpd_tls_cert_file = /etc/letsencrypt/live/mydomain.co.uk/fullchain.pem
smtpd_tls_key_file = /etc/letsencrypt/live/mydomain.co.uk/privkey.pem
smtpd_tls_session_cache_database = btree:${queue_directory}/smtpd_scache
smtpd_use_tls = yes
unknown_local_recipient_reject_code = 550
PS. I have also tried to address the root cause by contacting the owners
of the domain in question and informing them. I am not holding my breath
they will fix it.
Thanks.
Darren.
Links:
------
[1]
https://serverfault.com/questions/861268/postfix-ignoring-order-of-smtpd-recipient-restrictions
