Add plain saslauthd server

src/freedombone-base-email

@@ -1813,6 +1813,21 @@ function exim_enable_tls {
     else
         sed -i "s|MAIN_TLS_CERTIFICATE = /etc/letsencrypt.*|MAIN_TLS_CERTIFICATE = /etc/letsencrypt/live/$(hostname)/fullchain.pem|g" $exim_tls_config_file
     fi
+
+    exim_sasl_file=/etc/exim4/conf.d/auth/30_exim4-config_examples
+    if grep -q '# plain_saslauthd_server:' $exim_sasl_file; then
+        { echo '';
+          echo 'plain_saslauthd_server:';
+          echo '  driver = plaintext';
+          echo '  public_name = PLAIN';
+          echo "  server_condition = \${if saslauthd{{\$auth2}{\$auth3}}{1}{0}}";
+          echo "  server_set_id = \$auth2";
+          echo '  server_prompts = :';
+          echo '  .ifndef AUTH_SERVER_ALLOW_NOTLS_PASSWORDS';
+          echo "  server_advertise_condition = \${if eq{\$tls_in_cipher}{}{}{*}}";
+          echo '  .endif'; } >> $exim_sasl_file
+        sed -i '/# plain_saslauthd_server:/d' $exim_sasl_file
+    fi
 }
 
 function install_email {