This feature is available with artica version 1.4.100218
If you are under this release you need to upgrade your Artica version.
If this version is not released use the How to upgrade Artica to a nightly build ?
DomainKeys Identified Mail (DKIM) is a method for associating a domain name to an email, thereby allowing an organization to take responsibility for a message in a way that can be validated by a recipient. Remarkably, responsibility can be claimed independently of the message's actual authors or recipients. The validation technique is based on public-key cryptography: Responsibility is claimed by the signer by adding a domain name to the message and then also affixing a digital signature of it and the message. The value is placed in the DKIM-Signature: header field. The verifier recovers the signer's public key using the DNS, and then verifies the signature.
The DKIM signature can cover portions of a message, such as the From: and Subject: fields, and the message body (or its initial part). Thus, DKIM provides some protection against tampering with mail, offering end-to-end integrity between the signing module and the verifying module.
Prominent email service providers implementing DKIM include Yahoo, Gmail, and FastMail.FM. Any mail from these organizations should carry a DKIM signature.
Artica support OpenDKIM to verify mails signatures.
This feature is enabled when using the multiple postfix instances
Installing OpenDKIM
Currently only one distribution (Ubuntu >=10.x) support OpenDKIM in repositories
If you using Ubuntu 10 use
apt-get install opendkim
For Debian 5.x, Fedora, CentOS, OpenSuSe or Mandriva you need to use the Setup Center or this command-line :
/usr/share/artica-postfix/bin/artica-make APP_OPENDKIM
Enable OpenDKIM
If OpenDKIM is installed Artica will display a new icon in the Connexion Filters area
Click on the check-box "Activate OPenDKIM" and personalize the few settings in order to set the filter behavior.
By clicking on the "DNS records" artica show you TXT entries that you must insert in your Public DNS in order to help remote SMTP servers to identify your outgoing mails if remote servers use DKIM verifications.
Use the "DNS records validations" tab to check if your DNS signatures are correctly inserted and enables your domains in the DKIM scope.
