On Fri, Jun 03, 2011 at 11:09:23AM +0200, Andreas Schulze wrote:

Hello,

I have a system using postfix multi instance feature. The first, main postfix-instance is a nullclient as suggested by

If you call the default instance (as in http://www.postfix.org/MULTI_INSTANCE_README.html#default_instance) the "first, main postfix-instance" and this is the null-client instance, configured as sugested in the walk-through (http://www.postfix.org/MULTI_INSTANCE_README.html#quick), this should work.

What happens if you invoke sendmail manually, what happens to messages from cronjobs?

http://www.postfix.org/MULTI_INSTANCE_README.html#split

The second instance is for real use. Postfix receive mail and handover them to the dovecot lmtp server.

Thats working.

The lmtp server supports sieve. One account has activated a vacation rule. So while delivering a mail to this account, dovecot creates a new mail based on the vacation rules.

*This one* fail. It is injected in the main postfix instance, which is wrong in this case.

Why is this wrong? The vacation message is a locally generated message and as this should go to the null-client.

I tried to start dovecot with an additional environment MAIL_CONFIG=/etc/postfix-instance2

I doubt this will affect the sendmail call from sieves vacation plugin.

and enabled alternate_config_directories in main.cf of the first insance.

You should not alter the config_directory for the default instance.

( http://www.postfix.org/postconf.5.html#alternate_config_directories ) I also configured the userdb to return an extrafield ) userdb_mail_config=/etc/postfix-instance2.

Does this even exist?

But all produce strance postfix errors I never saw in my last 6 years as postfix-admin.

Would it be possible to configure dovecot lmtp server to use an external smtp-server to submit new mails ?

Any other Ideas ?

If none of the above pointers help, go to the postfix-users list and follow the guidelines in http://www.postfix.org/DEBUG_README.html#mail when reporting the problem.

Dennis