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Postfix cannot send emails outside of network

Link to this post 25 Feb 11

I know this issue comes up a lot, but none of the fixes I have found in the last couple days will work. I guess I will have to post my config and hope something sticks out to somebody. I have postfix installed on Ubuntu server 10.0.4 lts and can send/receive internally via smtp telnet session. I know this is probably something very simple, I just feel like I have tried everthing I have found to try. I followed the guide at https://help.ubuntu.com/community/Postfix . Here is my postconf -n:

me@myserver:~$ postconf -n
alias_database = hash:/etc/aliases
alias_maps = hash:/etc/aliases
append_dot_mydomain = no
biff = no
broken_sasl_auth_clients = yes
config_directory = /etc/postfix
home_mailbox = Maildir/
inet_interfaces = all
inet_protocols = all
mailbox_command =
mailbox_size_limit = 0
mydestination = myserver.mydomain.com, mydomain.com, localhost.mydomain.com, , localhost
mydomain = mydomain.com
myhostname = myserver.mydomain.com
mynetworks = 127.0.0.0/8, 192.168.20.0/24
myorigin = $mydomain
readme_directory = no
recipient_delimiter = +
relayhost =
smtp_tls_note_starttls_offer = yes
smtp_tls_security_level = may
smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache
smtpd_banner = $myhostname ESMTP $mail_name (Ubuntu)
smtpd_recipient_restrictions = permit_sasl_authenticated,permit_mynetworks,reject_unauth_destination
smtpd_sasl_auth_enable = yes
smtpd_sasl_local_domain =
smtpd_sasl_security_options = noanonymous
smtpd_tls_CAfile = /etc/ssl/certs/cacert.pem
smtpd_tls_auth_only = no
smtpd_tls_cert_file = /etc/ssl/certs/smtpd.crt
smtpd_tls_key_file = /etc/ssl/private/smtpd.key
smtpd_tls_loglevel = 1
smtpd_tls_received_header = yes
smtpd_tls_security_level = may
smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache
smtpd_tls_session_cache_timeout = 3600s
smtpd_use_tls = yes
tls_random_source = dev:/dev/urandom

And I get this message trying to send:

554 5.7.1 <xxxxxxxxxx@hotmail.com>: Relay access denied

Link to this post 26 Feb 11

I found the problem...finally! And of course it was something incredibly simple. Since I set it to use all protocols I needed [::1]/128 in the mynetworks = line. Is [::1]/128 the same as 127.0.0.0/8 in the sense that it is only my local machine? I am not opening up a security risk?

Postconf -n:

alias_database = hash:/etc/aliases
alias_maps = hash:/etc/aliases
append_dot_mydomain = no
biff = no
broken_sasl_auth_clients = yes
config_directory = /etc/postfix
home_mailbox = Maildir/
inet_interfaces = all
inet_protocols = all
mailbox_command =
mailbox_size_limit = 0
mydestination = myserver.mydomain.com, mydomain.com, localhost.mydomain.com, localhost
mydomain = mydomain.com
myhostname = myserver.mydomain.com
mynetworks = 127.0.0.0/8, 192.168.20.0/24, [::1]/128
myorigin = /etc/mailname
readme_directory = no
recipient_delimiter = +
relayhost =
smtp_tls_note_starttls_offer = yes
smtp_tls_security_level = may
smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache
smtpd_banner = $myhostname ESMTP $mail_name (Ubuntu)
smtpd_recipient_restrictions = permit_sasl_authenticated,permit_mynetworks,reject_unauth_destination
smtpd_sasl_auth_enable = yes
smtpd_sasl_local_domain =
smtpd_sasl_security_options = noanonymous
smtpd_tls_CAfile = /etc/ssl/certs/cacert.pem
smtpd_tls_auth_only = no
smtpd_tls_cert_file = /etc/ssl/certs/smtpd.crt
smtpd_tls_key_file = /etc/ssl/private/smtpd.key
smtpd_tls_loglevel = 1
smtpd_tls_received_header = yes
smtpd_tls_security_level = may
smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache
smtpd_tls_session_cache_timeout = 3600s
smtpd_use_tls = yes
tls_random_source = dev:/dev/urandom

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