Hi Kevin,

Apologies, its:

alias_database = hash:/etc/aliases
alias_maps = hash:/etc/aliases
command_directory = /usr/sbin
config_directory = /etc/postfix
daemon_directory = /usr/libexec/postfix
data_directory = /var/lib/postfix
debug_peer_level = 2
html_directory = no
inet_interfaces = all
inet_protocols = all
local_recipient_maps =
mail_owner = postfix
mailq_path = /usr/bin/mailq.postfix
manpage_directory = /usr/share/man
mydestination = sussexstudent.com, localhost.sussexstudent.com, $myhostname, localhost.$mydomain, localhost
mydomain = ussu.susx.ac.uk
myhostname = mail.ussusupport.co.uk
mynetworks = 139.184.150.0/28, 127.0.0.0/8
newaliases_path = /usr/bin/newaliases.postfix
queue_directory = /var/spool/postfix
readme_directory = /usr/share/doc/postfix-2.6.6/README_FILES
relayhost = [smtp.gmail.com]:587
sample_directory = /usr/share/doc/postfix-2.6.6/samples
sendmail_path = /usr/sbin/sendmail.postfix
setgid_group = postdrop
smtp_sasl_auth_enable = yes
smtp_sasl_password_maps = hash:/etc/postfix/sasl_passwd
smtp_sasl_security_options = noanonymous
smtp_sasl_tls_security_options = noanonymous
smtp_tls_CApath = /etc/ssl/certs
smtp_tls_loglevel = 1
smtp_tls_security_level = encrypt
smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache
smtp_use_tls = yes
smtpd_recipient_restrictions = permit_sasl_authenticated,permit_mynetworks,reject_unauth_destination
smtpd_sasl_auth_enable = yes
smtpd_sasl_local_domain = $myhostname
smtpd_tls_auth_only = no
smtpd_tls_cert_file = /etc/pki/tls/certs/rtsu.ussu.susx.ac.uk.crt
smtpd_tls_key_file = /etc/pki/tls/private/rtsu.ussu.susx.ac.uk.key
smtpd_tls_loglevel = 1
smtpd_tls_security_level = may
smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache
smtpd_use_tls = yes
unknown_local_recipient_reject_code = 450

I have tried a variety of hostname combinations -but I've been getting nowhere for a while now.

Hesan
On 13/08/2012 15:44, Kevin Falcone wrote:
o This usually points to misconfigured aliases or not listing the
hostname that mail is being delivered to in the list of hostnames
postfix knows about.  However, you've cut all the useful pieces out of
your error message so we're just guessing.

-kevin

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