diff --git a/services/dkim-key.scm b/services/dkim-key.scm
index d978f6b..0bd35b6 100644
--- a/services/dkim-key.scm
+++ b/services/dkim-key.scm
@@ -10,14 +10,15 @@
 (define-record-type* <dkim-key-configuration>
   dkim-key-configuration make-dkim-key-configuration
   dkim-key-configuration?
+  (directory dkim-key-configuration-directory (default "/etc/dkim"))
+  (owner dkim-key-configuration-owner (default "smtpd"))
   (domain dkim-key-configuration-selector (default ""))
   (selector dkim-key-configuration-selector (default "dkim"))
-  (directory dkim-key-configuration-directory (default "/etc/dkim"))
   (key-length dkim-key-configuration-key-length (default 1024)))
 
 (define (dkim-key-activation config)
   (match-record config <dkim-key-configuration>
-    (domain directory selector key-length)
+    (directory owner domain selector key-length)
     #~(begin
       (use-modules (guix build utils))
       (mkdir-p #$directory)
@@ -29,7 +30,7 @@
           (unless (file-exists? private)
             (let ((openssl #$(file-append openssl "/bin/openssl")))
               (system* openssl "genrsa" "-out" private (number->string #$key-length))
-              (chown private (passwd:uid (getpwnam "smtpd")) -1)
+              (chown private (passwd:uid (getpwnam #$owner)) -1)
               (system* openssl "rsa" "-in" private "-pubout" "-out" public)
               (system* "sed" "-i"
                        "1s/.*/v=DKIM1;p=/;:nl;${s/-----.*//;q;};N;s/\\n//g;b nl;"