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-rw-r--r--modules/services/nixos-mailserver.nix5
1 files changed, 5 insertions, 0 deletions
diff --git a/modules/services/nixos-mailserver.nix b/modules/services/nixos-mailserver.nix
index 715558d..a794430 100644
--- a/modules/services/nixos-mailserver.nix
+++ b/modules/services/nixos-mailserver.nix
@@ -131,6 +131,11 @@ in
         "vcard_attachments"
         "zipdownload"
       ];
+
+      extraConfig = ''
+        # STARTTLS required for authn, therefore the domain must match the SSL cert.
+        $config['smtp_server'] = 'tls://${config.mailserver.fqdn}';
+      '';
     };
 
     services.nginx.virtualHosts.${cfg.webmail.realHost} = {