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Postfix main.cf example debian11/29/2023 The following sections discuss opendkim configuration options in more detail. The generated file /etc/dkimkeys/2021.txt contains that record for your convenience. Don’t forget to publish your public key as a TXT record in DNS at 2021._. Edit /etc/postfix/main.cf to connect the two:Īnd finally reload the Postfix configuration with sudo systemctl reload postfix.ĭone! Your mail is now being signed and verified. The final step is integrating the opendkim service with Postfix. Restart the service with sudo systemctl restart opendkim. For the socket, the easiest option is to use a TCP socket listening on a local port (bypassing socket file ownership or chroot access issues). Four parameters need to be adapted: the domain/selector/key file triple, and the socket. Sudo -u opendkim opendkim-genkey -D /etc/dkimkeys -d -s 2021 Next, generate the key pair for your DNS domain and selector: For a fuller discussion of the setup options available, please refer to the subsequent sections. This is the five-minute version of opendkim configuration for the impatient. The quickstart instructions in this section describe setting up a minimal, but functional installation of opendkim for signing and verifying, integrated with Postfix. Jump to #Quickstart for an overview and minimal setup, and refer to #Configuration for the complete picture. It can be configured to reject mail that has missing or invalid DKIM signatures. OpenDKIM can add DKIM signatures to outbound mail and check DKIM signatures on inbound mail. In tandem, DNS is used to publish TXT records with the public portion of the cryptographic certificate used for digital signing. Instead of the traditional IP-address to determine the message sender, DKIM adds a digital signature associated with the domain name of the organization. Upstream development at OpenDKIM is a community effort.ĭomainKeys Identified Mail (DKIM) combines several existing antiphishing and antispam methods to improve the quality of the classification and identification of legitimate e-mail. The opendkim package contains a full-featured DKIM milter ( mail filter) implementation suitable for use with MTAs (Message Transfer Agent mail servers) such as Postfix.
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