Thanks to Olivier & Daryl for their feedback. However I'm still having
problems with postfix adding it's $myhostname to unqualified addresses.

My postfix smtp gateway is setup as a null client, but with a relay table.
All internal mail is relayed to another internal box, and mail for
external addresses is sent direct.

Mail sent from cron jobs on various machines, goes to the smtp gateway.
However these mails are just send to 'user' and not 'userdomain' .However
postfix interprets it as being for the relay machine and not for
userdomain. It adds 'smtp.tcd.ie' to the unqualified addresses, and
therefore it does not pass it on to the next machine, but tries to deliver
it locally.

Received: from web2.tcd.ie (web2.tcd.ie [134.226.1.115])
        by dux1.tcd.ie (Postfix) with ESMTP id 891CC457
        for <gordonsmtp.tcd.ie>; Mon, 1 Oct 2001 00:04:43 +0100 (IST)
Received: (from rootlocalhost)
        by web2.tcd.ie (8.11.2/8.11.1) id f8UN4WY08671
        for gordon; Mon, 1 Oct 2001 00:04:32 +0100 (IST)

My postfconf follows. The main things are:

myhostname = dux1.tcd.ie
mydomain = tcd.ie
myorigin = $mydomain
mydestination = $mydomain

Should I change $myhostname to the same as $mydomain too ?

Any advice appreciated.

Thanks

Paul

==================
2bounce_notice_recipient = postmaster
access_map_reject_code = 554
alias_database = dbm:/etc/postfix/aliases
alias_maps = dbm:/etc/postfix/aliases
allow_mail_to_commands = alias,forward
allow_mail_to_files = alias,forward
allow_min_user = no
allow_percent_hack = yes
allow_untrusted_routing = no
always_bcc =
append_at_myorigin = yes
append_dot_mydomain = yes
best_mx_transport =
biff = yes
body_checks =
bounce_notice_recipient = postmaster
bounce_size_limit = 50000
broken_sasl_auth_clients = no
canonical_maps =
command_directory = /usr/sbin
command_expansion_filter =
1234567890!%-_=+:,./abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ
command_time_limit = 1000s
content_filter =
daemon_directory = /usr/libexec/postfix
daemon_timeout = 18000s
debug_peer_level = 2
debug_peer_list =
default_database_type = dbm
default_destination_concurrency_limit = 10
default_destination_recipient_limit = 50
default_privs = nobody
default_process_limit = 50
default_transport = smtp
defer_transports =
delay_notice_recipient = postmaster
delay_warning_time = 0h
deliver_lock_attempts = 20
deliver_lock_delay = 1s
disable_dns_lookups = no
disable_vrfy_command = no
dont_remove = 0
double_bounce_sender = double-bounce
duplicate_filter_limit = 1000
empty_address_recipient = MAILER-DAEMON
error_notice_recipient = postmaster
expand_owner_alias = no
export_environment = TZ
extract_recipient_limit = 10240
fallback_relay = [tcdalpha.tcd.ie]
fallback_transport =
fast_flush_domains = $relay_domains
fast_flush_purge_time = 7d
fast_flush_refresh_time = 12h
fork_attempts = 5
fork_delay = 1s
forward_expansion_filter =
1234567890!%-_=+:,./abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ
forward_path =
$home/.forward${recipient_delimiter}${extension},$home/.forward
hash_queue_depth = 2
hash_queue_names = incoming,active,deferred,bounce,defer,flush
header_checks =
header_size_limit = 102400
home_mailbox =
hopcount_limit = 50
ignore_mx_lookup_error = no
import_environment = MAIL_CONFIG MAIL_DEBUG TZ XAUTHORITY DISPLAY
inet_interfaces = all
initial_destination_concurrency = 5
invalid_hostname_reject_code = 501
ipc_idle = 100s
ipc_timeout = 3600s
line_length_limit = 2048
lmtp_cache_connection = yes
lmtp_connect_timeout = 0s
lmtp_data_done_timeout = 600s
lmtp_data_init_timeout = 120s
lmtp_data_xfer_timeout = 180s
lmtp_lhlo_timeout = 300s
lmtp_mail_timeout = 300s
lmtp_quit_timeout = 300s
lmtp_rcpt_timeout = 300s
lmtp_rset_timeout = 300s
lmtp_sasl_auth_enable = no
lmtp_sasl_password_maps =
lmtp_sasl_security_options = noplaintext, noanonymous
lmtp_skip_quit_response = no
lmtp_tcp_port = 24
local_command_shell =
local_destination_concurrency_limit = 2
local_destination_recipient_limit = 1
local_recipient_maps =
local_transport = local
luser_relay =
mail_name = Postfix
mail_owner = postfix
mail_spool_directory = /var/spool/mail
mail_version = Postfix-20010228-pl04
mailbox_command =
mailbox_delivery_lock = flock, dotlock
mailbox_size_limit = 51200000
mailbox_transport =
maps_rbl_domains = blackholes.mail-abuse.org
maps_rbl_reject_code = 554
masquerade_domains =
masquerade_exceptions =
max_idle = 100s
max_use = 100
maximal_backoff_time = 4000s
maximal_queue_lifetime = 5d
message_size_limit = 10240000
minimal_backoff_time = 1000s
mydestination = $mydomain
mydomain = tcd.ie
myhostname = dux1.tcd.ie
mynetworks = 134.226.0.0/24 193.1.67.0/21 127.0.0.0/8
mynetworks_style = subnet
myorigin = $mydomain
non_fqdn_reject_code = 504
notify_classes = resource,software
owner_request_special = yes
prepend_delivered_header = command, file, forward
process_id_directory = pid
program_directory = /usr/libexec/postfix
propagate_unmatched_extensions = canonical, virtual
qmgr_fudge_factor = 100
qmgr_message_active_limit = 10000
qmgr_message_recipient_limit = 10000
qmgr_site_hog_factor = 100
queue_directory = /var/spool/postfix
queue_minfree = 0
queue_run_delay = 1000s
recipient_canonical_maps =
recipient_delimiter =
reject_code = 554
relay_domains = $mydestination
relay_domains_reject_code = 554
relayhost =
relocated_maps =
require_home_directory = no
sender_canonical_maps =
service_throttle_time = 60s
smtp_always_send_ehlo = no
smtp_bind_address =
smtp_connect_timeout = 0s
smtp_data_done_timeout = 600s
smtp_data_init_timeout = 120s
smtp_data_xfer_timeout = 180s
smtp_destination_concurrency_limit =
$default_destination_concurrency_limit
smtp_destination_recipient_limit = $default_destination_recipient_limit
smtp_helo_timeout = 300s
smtp_mail_timeout = 300s
smtp_never_send_ehlo = no
smtp_quit_timeout = 300s
smtp_rcpt_timeout = 300s
smtp_sasl_auth_enable = no
smtp_sasl_password_maps =
smtp_sasl_security_options = noplaintext, noanonymous
smtp_skip_4xx_greeting = yes
smtp_skip_5xx_greeting = yes
smtp_skip_quit_response = yes
smtpd_banner = $myhostname ESMTP $mail_name
smtpd_client_restrictions =
smtpd_delay_reject = yes
smtpd_error_sleep_time = 5s
smtpd_etrn_restrictions =
smtpd_hard_error_limit = 100
smtpd_helo_required = no
smtpd_helo_restrictions =
smtpd_junk_command_limit = 1000
smtpd_recipient_limit = 1000
smtpd_recipient_restrictions = permit_mynetworks,check_relay_domains
smtpd_restriction_classes =
smtpd_sasl_auth_enable = no
smtpd_sasl_local_domain = $myhostname
smtpd_sasl_security_options = noanonymous
smtpd_sender_restrictions =
smtpd_soft_error_limit = 10
smtpd_timeout = 300s
soft_bounce = no
stale_lock_time = 500s
strict_rfc821_envelopes = no
sun_mailtool_compatibility = no
swap_bangpath = yes
syslog_facility = mail
transport_maps = dbm:/etc/postfix/transport
transport_retry_time = 60s
trigger_timeout = 10s
undisclosed_recipients_header = To: undisclosed-recipients:;
unknown_address_reject_code = 450
unknown_client_reject_code = 450
unknown_hostname_reject_code = 450
virtual_maps =

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