+ /* Set IPv4 or IPv6 */
+
+ host_af = Ustrchr(host->address, ':') ? AF_INET6 : AF_INET;
+
+ /* Expand and interpret the interface and port strings. The latter will not
+ be used if there is a host-specific port (e.g. from a manualroute router).
+ This has to be delayed till now, because they may expand differently for
+ different hosts. If there's a failure, log it, but carry on with the
+ defaults. */
+
+ deliver_host = host->name;
+ deliver_host_address = host->address;
+ deliver_host_port = host->port;
+ deliver_domain = addr->domain;
+ transport_name = addr->transport->name;
+
+ if ( !smtp_get_interface(tf->interface, host_af, addr, &interface,
+ US"callout")
+ || !smtp_get_port(tf->port, addr, &port, US"callout")
+ )
+ log_write(0, LOG_MAIN|LOG_PANIC, "<%s>: %s", addr->address,
+ addr->message);
+
+ sx.addrlist = addr;
+ sx.host = host;
+ sx.host_af = host_af,
+ sx.port = port;
+ sx.interface = interface;
+ sx.helo_data = tf->helo_data;
+ sx.tblock = addr->transport;
+ sx.verify = TRUE;
+
+tls_retry_connection:
+ /* Set the address state so that errors are recorded in it */
+
+ addr->transport_return = PENDING_DEFER;
+ ob->connect_timeout = callout_connect;
+ ob->command_timeout = callout;
+
+ /* Get the channel set up ready for a message (MAIL FROM being the next
+ SMTP command to send. If we tried TLS but it failed, try again without
+ if permitted */
+
+ yield = smtp_setup_conn(&sx, FALSE);
+#ifdef SUPPORT_TLS
+ if ( yield == DEFER
+ && addr->basic_errno == ERRNO_TLSFAILURE
+ && ob->tls_tempfail_tryclear
+ && verify_check_given_host(CUSS &ob->hosts_require_tls, host) != OK
+ )