dkim missing with smtp postfix server for multiple domains?

Question

I have many domain on one server.

I want enable DKIM verification for each one. For do it, I follow this tutorial Like said a the end of tutorial, I test my dkim DNS on http://dkimcore.org/c/keycheck

This is a valid DKIM key record

So it's supose to works right now, but when I send an email, there is no DKIM signature and only "domainkeys=neutral (no sig); dkim=neutral (no sig)". (tested on yahoo and gmail.)

So what's wrong with this method?

EDIT:

mail.log when I send a mail (with PHP) said:

opendkim[40952]: 628EF242A06: localhost [127.0.0.1] not internal
opendkim[40952]: 628EF242A06: not authenticated
opendkim[40952]: 628EF242A06: no signature data

other thing:

sudo opendkim-testkey -d mydomain.com -s default -k /etc/opendkim/keys/mydomain.com/default.private -v

response:

opendkim-testkey: key not secure

So it's the method to generate keys which is bad?

Answer 1

I add 127.0.0.1 and localhost to trusted host and used :

 sudo service postfix reload

Now it's working... enjoy ;)