550 5.1.1 <[email protected]> User doesn't exist: [email protected] (in reply to RCPT TO command))

Question

this is just killing me I really need fix it, well I'm setting up a Postfix Dovecot Sasl server in Gentoo with a FQDN for my personal domain and till now I can't surpass this

May 27 21:11:05 mail postfix/lmtp[3857]: 5EF9F41D14B8: to=<[email protected]>, orig_to=<[email protected]>, relay=mail.midomain.com[private/dovecot-lmtp], delay=8823, delays=8822/0.13/0.1/0.05, dsn=4.1.1, status=SOFTBOUNCE (host mail.midomain.com[private/dovecot-lmtp] said: 550 5.1.1 <[email protected]> User doesn't exist: [email protected] (in reply to RCPT TO command))

my postconf is on https://dpaste.com/29GUHS4DQ

I know it has to be just one little thing but i have not find it, I check permission on the mailbox there are user:mail on each file on /var/mail/* I did uncomment user_filter = (&(objectClass=posixAccount)(uid=%u)) and recipient_delimiter = +

I have not set virtual manuelly since only need the local users UNIX Users, what else could be ?

postconf -n
command_directory = /usr/sbin
compatibility_level = 3.6
daemon_directory = /usr/libexec/postfix
data_directory = /var/lib/postfix
debug_peer_level = 4
debugger_command = PATH=/bin:/usr/bin:/usr/local/bin:/usr/X11R6/bin ddd $daemon_directory/$process_name $process_id & sleep 5
html_directory = no
inet_interfaces = all
inet_protocols = ipv4
local_recipient_maps =
mail_owner = postfix
mailbox_command = /usr/libexec/dovecot/dovecot-lda -f "$SENDER" -a "$RECIPIENT"
mailbox_transport = lmtp:unix:private/dovecot-lmtp
mailq_path = /usr/bin/mailq
manpage_directory = /usr/share/man
meta_directory = /etc/postfix
mydestination = $myhostname, localhost.$mydomain, localhost, $mydomain, mail.$mydomain
mydomain = mydomain.com
myhostname = mail.mydomain.com
mynetworks = 10.8.0.0/16, 127.0.0.0/8
mynetworks_style = host
myorigin = $mydomain
newaliases_path = /usr/bin/newaliases
queue_directory = /var/spool/postfix
readme_directory = no
recipient_delimiter = +
sample_directory = /etc/postfix
sendmail_path = /usr/sbin/sendmail
setgid_group = postdrop
shlib_directory = /usr/lib64/postfix/${mail_version}
smtp_enforce_tls = yes
smtp_tls_CAfile = /etc/ssl/certs/ca-certificates.crt
smtp_tls_note_starttls_offer = yes
smtp_use_tls = yes
smtpd_recipient_restrictions = permit_sasl_authenticated,permit_mynetworks,reject_unauth_destination
smtpd_sasl_auth_enable = yes
smtpd_sasl_local_domain = $myhostname
smtpd_sasl_path = private/auth
smtpd_sasl_type = dovecot
smtpd_tls_CAfile = /etc/ssl/certs/My_CA_Bundle.crt
smtpd_tls_auth_only = no
smtpd_tls_cert_file = /etc/ssl/certs/mydomain_com.crt
smtpd_tls_key_file = /etc/ssl/private/mydomain.com.key
smtpd_tls_loglevel = 1
smtpd_tls_mandatory_protocols = !SSLv2,!SSLv3
smtpd_tls_protocols = !SSLv2,!SSLv3
smtpd_tls_received_header = yes
smtpd_tls_security_level = may
smtpd_tls_session_cache_timeout = 3600s
smtpd_use_tls = yes
soft_bounce = yes
tls_random_source = dev:/dev/urandom
unknown_local_recipient_reject_code = 550

Answer 1

It's Dovecot who rejects mail, read an error message carefully: host mail.midomain.com[private/dovecot-lmtp] said: 550 5.1.1 <[email protected]> User doesn't exist: [email protected] (in reply to RCPT TO command).

Notice also, to=<[email protected]>, orig_to=<[email protected]> in the beginning of the error message. Why it become user@mail...? Do you have an alias which maps [email protected] users to [email protected]? Was it desired?

Also, there is another problem, which may put your server into various blacklists. You have empty local_recipient_maps. So, Postfix will recieve and queue the mail for any user within your domain, but if the mail will be further rejected by Dovecot, it will bounce, generating a backscatter, which is seen as spam by many. Better leave the default setting which has unix:passwd.byname in it, so Postfix will reject such mail early and won't generate backscatter.