Video Tutorial Of The Month

Each month we post one of our videos from our extensive eLearning video library. Our web-based training covers both the concepts and the practical uses of MDaemon or SecurityGateway.

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Signing Outbound Messages using DKIM

In last month's video of the month, we introduced the topic of DomainKeys Identified Mail (DKIM). DKIM is a spam-fighting technique that allows you to check the sender and integrity of a message. The primary goal of this technology is to prevent spammers from faking their identity. In the first phase of DKIM, the domain owner generates a pair of keys, one public and one private. The private key is kept on the server, while the public key is stored in DNS. In the second phase of the process, each email sent by the server has a signature applied by the private copy of the key stored on the server. The signature is applied to the outgoing email in the form of a header, and is then sent to the internet and follows its normal sorting process. In the third phase of the process, the receiving mail server extracts the signature and declared sender from the incoming message, and retrieves the information relative to the key and the sender from DNS. The information held in the public and private keys is then checked to ensure that it matches.

This month's video explains the procedure for configuring MDaemon to sign outbound messages using DKIM.

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