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Old 14th September 2008, 11:28
waf waf is offline
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Default Postfix relayhost trouble

Hi, I'm in charge of a postfix 2.5 server called club.school.edu at a university (school.edu). It is set to accept emails of the form clubmember@club.school.edu and redirect them to student's username@school.edu via a relayhost called emailrelay.school.edu. Every time someone sends an email to clubmember@club.school.edu the email correctly arrives at username@school.edu, but the sender gets an additional email from the school.edu email server that says:

Delivery has failed to these recipients or distribution lists:

The recipient's e-mail address was not found in the recipient's e-mail system. Microsoft Exchange will not try to redeliver this message for you. Please check the e-mail address and try resending this message, or provide the following diagnostic text to your system administrator.

The mail.log entry on the club.school.edu server has the following
entry for the email:
to=<username@school.edu>, orig_to=<clubmember@club.school.edu>, relay=emailrelay.school.edu[<<ip redacted>>]:25, delay=0.42, delays=0.06/0.02/0.01/0.34, dsn=2.6.0, status=sent (250 2.6.0 <8199E5FF8EFA8B43AAE85CB33FD4ED780144150D@EVS-CCR.school.edu> Queued mail for delivery)
Does anybody know how I can prevent this error message from happening?

postconf -n gives the following
alias_database = hash:/etc/aliases
alias_maps = hash:/etc/aliases
append_dot_mydomain = yes
biff = no
config_directory = /etc/postfix
disable_vrfy_command = no
header_checks = regexp:/etc/postfix/header_checks
inet_interfaces = all
inet_protocols = ipv4
mailbox_command =
mailbox_size_limit = 0
mydestination = club.school.edu, localhost.school.edu, localhost, ,
mydomain = school.edu
myhostname = club.school.edu
mynetworks =
myorigin = /etc/mailname
notify_classes =
recipient_delimiter =
relayhost = emailrelay.school.edu
smtp_tls_session_cache_database = btree:${queue_directory}/smtp_scache
smtpd_banner = $myhostname mail server
smtpd_client_restrictions = reject_unknown_client
smtpd_delay_reject = yes
smtpd_helo_required = yes
smtpd_helo_restrictions = permit_mynetworks,
smtpd_recipient_restrictions = reject_unauth_pipelining,
smtpd_sender_restrictions = permit_sasl_authenticated,
smtpd_tls_cert_file = /etc/ssl/certs/ssl-cert-snakeoil.pem
smtpd_tls_key_file = /etc/ssl/private/ssl-cert-snakeoil.key
smtpd_tls_session_cache_database = btree:${queue_directory}/smtpd_scache
smtpd_use_tls = yes
my /etc/aliases file contains mappings of the style:
clubmember: username@school.edu

Thanks for any help!
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