Ryfujk

I am working on building a secure mail server for the first time using Postfix and Dovecot and I have encountered a problem that I cannot surpass.

To not get put in the spam box of remote servers I set up a SPF and DKIM following this tutorial. The problem I now have is my server is rejecting the recipient address on my server when delivered from remote services like Gmail.

NOQUEUE: reject: RCPT from sonic311-43.consmr.mail.bf2.yahoo.com[74.6.131.217]: 451 4.3.5 <john@myserver.com>: Recipient address rejected: Server configuration problem;

This is my /etc/postfix/main.cf

# 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 (Ubuntu)

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

smtpd_tls_cert_file=/etc/letsencrypt/live/mail.myserver.com/fullchain.pem

smtpd_tls_key_file=/etc/letsencrypt/live/mail.myserver.com/privkey.pem

smtpd_use_tls=yes

smtpd_tls_auth_only = yes



smtpd_sasl_type = dovecot

smtpd_sasl_path = private/auth

smtpd_sasl_auth_enable = yes

smtpd_recipient_restrictions =

  permit_mynetworks

  permit_sasl_authenticated

  reject_unauth_destination

  check_policy_service unix:private/policyd-spf



# Milter configuration

milter_default_action = accept

milter_protocol = 6

smtpd_milters = local:/opendkim/opendkim.sock

non_smtpd_milters = $smtpd_milters





# 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 = myserver.com

alias_maps = hash:/etc/aliases

alias_database = hash:/etc/aliases

myorigin = /etc/mailname

# mydestination = $myhostname, localhost.localdomain, localhost

mydestination = 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

inet_protocols = all

home_mailbox = Maildir/

virtual_transport = lmtp:unix:private/dovecot-lmtp

virtual_mailbox_domains = mysql:/etc/postfix/mysql-virtual-mailbox-domains.cf

virtual_mailbox_maps = mysql:/etc/postfix/mysql-virtual-mailbox-maps.cf

virtual_alias_maps = mysql:/etc/postfix/mysql-virtual-alias-maps.cf



policyd-spf_time_limit = 3600

Initially, Outbound mail timed out until I added

permit_sasl_authenticated

reject_unauth_destination

under smtpd_recipient_restrictions

How do I get my server to accept mail?