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--- doc:appunti:linux:sa:postfix_opendkim [2023/06/15 10:41] – [Configure Postfix] niccolo
+++ doc:appunti:linux:sa:postfix_opendkim [2023/10/31 11:06] (current) – [OpenDKIM on Postfix with virtual domains] niccolo
@@ Line 1: / Line 1: @@
 ====== OpenDKIM on Postfix with virtual domains ======
-In this article we will install **[[http://www.opendkim.org/|OpenDKIM]]** on a GNU/Linux mail server based on **Debian 11 Buster**. The mail service is provided by **Postfix** configured for virtual domains using **virtual_alias_domains**.
+In this tutorial we will install **[[http://www.opendkim.org/|OpenDKIM]]** on a GNU/Linux mail server based on **Debian 11 Buster**. The mail service is provided by **Postfix** configured for virtual domains using **virtual_alias_domains**.
 <code>
 apt install opendkim opendkim-tools
 </code>
+In Debian 11 Bullseye the service is controlled (enable, start, stop, etc.) by Systemd:
+<code>
+systemctl status opendkim.service
+</code>
+Because Postfix is running into a chroot, it cannot access the ''/run/opendkim/opendkim.sock'' Unix socket to communicate with opendkim, so we change the ''Socket'' option into **/etc/opendkim.conf** and make the daemon to be listening on port **127.0.0.1:8891/TCP**:
+<file>
+Socket  inet:8891@localhost
+</file>
+The same daemon is used both for signing and verifying. Signing is performed when the client connecting to the MUA is authenticated and the **From:** address matches the domains to be signed (see the command line option **%%-d%%** or the **SigningTable** option of the ''/etc/opendkim.conf'' configuration file), verifying is performed in other cases.
 ===== Create the keys in /etc/dkimkeys/ =====