ini_set('display_errors',0);
ini_set('display_startup_errors',0);

ini_set('display_errors',1);
ini_set('display_startup_errors',1);

telnet smtp.server.de 25

display_errors Off

driver = pipe
return_output
driver = pipe
group = "${lookup{$domain}lsearch* {/etc/userdomains}{$value}}"
return_output
user = "${lookup{$domain}lsearch* {/etc/userdomains}{$value}}"