id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc	uname	nginx_version
519	defect in ngx_mail_send function	Zerray Zhou		"mail/ngx_mail_handler.c:561
{{{
561     if (n > 0) {
562         s->out.len -= n;
563
564         if (wev->timer_set) {
565             ngx_del_timer(wev);
566         }
567
568         if (s->quit) {
569             ngx_mail_close_connection(c);
570             return;
571         }
572
573         if (s->blocked) {
574             c->read->handler(c->read);
575         }
576
577         return;
578     }
}}}

the return statement in line 577, cause no more ngx_handle_write_event follow, so when n > 0 and n != s->out.len, it will wait for send forever
also for line 562, there should be followed by s->out.data += n, otherwise the data sent will be incorrect"	defect	closed	minor		nginx-module	1.4.x	fixed	mail			"nginx version: nginx/1.4.5
built by gcc 4.4.6 20120305 (Red Hat 4.4.6-4) (GCC)"