Code Block from Exim Source/src/transports/smtp.c

Exim version - 4.95-4

"Retry time not reached for any host <destination-domain-name>" Error

        
		/* In the normal, non-wrapper case, add a standard message to each deferred
address if there hasn't been an error, that is, if it hasn't actually been
tried this time. The variable "expired" will be FALSE if any deliveries were
actually tried, or if there was at least one host that was not expired. That
is, it is TRUE only if no deliveries were tried and all hosts were expired. If
a delivery has been tried, an error code will be set, and the failing of the
message is handled by the retry code later.

If queue_smtp is set, or this transport was called to send a subsequent message
down an existing TCP/IP connection, and something caused the host not to be
found, we end up here, but can detect these cases and handle them specially. */

for (address_item * addr = addrlist; addr; addr = addr->next)
  {
  /* If host is not NULL, it means that we stopped processing the host list
  because of hosts_max_try or hosts_max_try_hardlimit. In the former case, this
  means we need to behave as if some hosts were skipped because their retry
  time had not come. Specifically, this prevents the address from timing out.
  However, if we have hit hosts_max_try_hardlimit, we want to behave as if all
  hosts were tried. */

  if (host)
    if (total_hosts_tried >= ob->hosts_max_try_hardlimit)
      {
      DEBUG(D_transport)
        debug_printf("hosts_max_try_hardlimit reached: behave as if all "
          "hosts were tried\n");
      }
    else
      {
      DEBUG(D_transport)
        debug_printf("hosts_max_try limit caused some hosts to be skipped\n");
      setflag(addr, af_retry_skipped);
      }

  if (f.queue_smtp)    /* no deliveries attempted */
    {
    addr->transport_return = DEFER;
    addr->basic_errno = 0;
    addr->message = US"SMTP delivery explicitly queued";
    }

  else if (  addr->transport_return == DEFER
	  && (addr->basic_errno == ERRNO_UNKNOWNERROR || addr->basic_errno == 0)
	  && !addr->message
	  )
    {
    addr->basic_errno = ERRNO_HRETRY;
    if (continue_hostname)
      addr->message = US"no host found for existing SMTP connection";
    else if (expired)
      {
      setflag(addr, af_pass_message);   /* This is not a security risk */
      addr->message = string_sprintf(
	"all hosts%s have been failing for a long time %s",
	addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"",
        ob->delay_after_cutoff
	? US"(and retry time not reached)"
	: US"and were last tried after this message arrived");

      /* If we are already using fallback hosts, or there are no fallback hosts
      defined, convert the result to FAIL to cause a bounce. */

      if (addr->host_list == addr->fallback_hosts || !addr->fallback_hosts)
        addr->transport_return = FAIL;
      }
    else
      {
      const char * s;
      if (hosts_retry == hosts_total)
        s = "retry time not reached for any host%s";
      else if (hosts_fail == hosts_total)
        s = "all host address lookups%s failed permanently";
      else if (hosts_defer == hosts_total)
        s = "all host address lookups%s failed temporarily";
      else if (hosts_serial == hosts_total)
        s = "connection limit reached for all hosts%s";
      else if (hosts_fail+hosts_defer == hosts_total)
        s = "all host address lookups%s failed";
      else
        s = "some host address lookups failed and retry time "
        "not reached for other hosts or connection limit reached%s";

      addr->message = string_sprintf(s,
	addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"");
      }
    }
  }