Email Aliases aren't working: "User Unknown"

[supanatral]

We deployed a brand new server today but to our surprise, we have encountered issues with email aliases not working. The mailboxes work however when someone sends an email to an alias, it gets a bounce back saying "user unknown"

When looking in the logs, I find this:

Feb 10 19:10:30 NT-MAIL01 postfix/pipe[4445]: 562692214AD: to=<jhughes@domain.com>, relay=maildrop, delay=0.2, delays=0.1/0/0/0.09, dsn=5.1.1, status=bounced (user unknown. Command output: Invalid user specified. )

Why isn't this working?

[falko]

Can you post your main.cf and master.cf?

Which tutorial (URL) did you use to set up the system?

[supanatral]

I have attached the two files.

The tutorial I used is the following:
http://www.howtoforge.com/perfect-se...64-ispconfig-3

[till]

I guess the problem is that you removed the content filtering part, so that aliases are not resolved anyore on your server.

Either you enable content filter again by removing the # in fron of the line:

#content_filter = amavis:[127.0.0.1]:10024

or you disable this line as well:

receive_override_options = no_address_mappings