On 01/02/2012 02:00 AM, Philip Prindeville wrote:
I have a 'border' postfix MTA that doesn't host any mailboxes, indeed it
doesn't even know what the valid usernames are for the domain.
It merely serves to check messages for viruses, and block DoS attacks.
As such, I need it to perform aliasing *only* on messages generated locally by
system services, such as 'cron'.
How do I configure that? I.e. that if a message is submitted locally by a
service such as 'cron' or 'logwatch', it should be aliased to an internal
mailbox name on an Intranet server...
Thanks,
-Philip
There are several approaches.
Local processes use sendmail(1) to submit mail.
This is partly outside the normal flow of SMTP mail, as diagrammed here:
http://www.postfix.org/OVERVIEW.html#receiving
The pickup(8) service allows you to specify a content_filter, which you
could use to inject this mail into a separate smtpd(8) listener with
different restrictions than the main port 25 listener, one of those
being to allow aliasing to external recipients.
You could also set receive_override_options on the pickup(8) service
directly, and disable them on the normal smtpd(8) listener.
http://www.postfix.org/pickup.8.html
http://www.postfix.org/postconf.5.html#content_filter
http://www.postfix.org/FILTER_README.html
http://www.postfix.org/postconf.5.html#receive_override_options
--
J.
