[Flyzone]

We have a mail problem with the new OS X server. Al works fine except for a couple of issue that are very annoing.
First, sending an email to an unknown user or mispell the name of a user will not create a reply message from the server such us "Mail Undeliverable etcc..."
If I send to x@mydomain.com and x is not a user, the server will not advise the sender. I can see the error on the log.
Activating the forward Undeliverable Incoming Mail, basically forwarding a CC copy of the message to myself (BTW - this section is different on 10.3 from the manual ) doesn't produce any results.
Apple tech told me that this is a problem with version 10.3 but Apple Tech support was wrong in another 2 issues that I had in the past 2 days.
It seems like there's no user like postmaster or admin set up that can send a reply to people that mistake the email address. Problem is that there's no indication other than setup a Postmaster account in the workgroup.
Any help will be great.
Thanks,
Fly

[Rainy Day]

Sounds to me like a Postfix configuration setting needs to be changed. Not sure which one offhand.

[Flyzone]

Originally posted by Rainy Day:
Sounds to me like a Postfix configuration setting needs to be changed. Not sure which one offhand.

It looks like my server is reporting a 450 error code on the reply. Usually for unknow user the error is 550 but I can't see any particular configuration in the GUI.

[Rainy Day]

Well 450 is a temporary error, so your Postfix may be configured to return a “soft” error for debugging purposes (which i think is the default). The problem might be solved by setting this parameter in in your main.cf file:

unknown_local_recipient_reject_code = 550

This is from the Postfix main.cf file and helps to explain things a bit:

Code:
# The unknown_local_recipient_reject_code specifies the SMTP server
# response code when a recipient domain matches $mydestination or
# $inet_interfaces, while $local_recipient_maps is non-empty and the
# recipient address or address local-part is not found.
#
# The default setting is 550 (reject mail) but it is safer to start
# with 450 (try again later) until you are certain that your
# local_recipient_maps settings are OK.
#
#unknown_local_recipient_reject_code = 550
unknown_local_recipient_reject_code = 450

Notice how the 550 value is commented out?

[Flyzone]

Originally posted by Rainy Day:
Well 450 is a temporary error, so your Postfix may be configured to return a “soft” error for debugging purposes (which i think is the default). The problem might be solved by setting this parameter in in your main.cf file:

unknown_local_recipient_reject_code = 550

This is from the Postfix main.cf file and helps to explain things a bit:

Code:
# The unknown_local_recipient_reject_code specifies the SMTP server
# response code when a recipient domain matches $mydestination or
# $inet_interfaces, while $local_recipient_maps is non-empty and the
# recipient address or address local-part is not found.
#
# The default setting is 550 (reject mail) but it is safer to start
# with 450 (try again later) until you are certain that your
# local_recipient_maps settings are OK.
#
#unknown_local_recipient_reject_code = 550
unknown_local_recipient_reject_code = 450

Notice how the 550 value is commented out?

You're wright, here's the answer that Apple tech support sent me.

Per e-mails not bouncing
this is due to an entry in /etc/postfix/main.cf
the line
unknown_local_recipient_reject_code = 450
needs to be
unknown_local_recipient_reject_code = 550
otherwise the server will continue to try to deliver the undeliverable mail.
If you want mail to unknown users to be rejected immediately you can
change the entry with this command.
1. stop the mail server
2. in terminal run this command
sudo postconf -e unknown_local_recipient_reject_code=550
3. then start the mail server again.

Thanks,
fly