nginx 0.7.3 *) Change: the "rss" extension MIME type has been changed to "application/rss+xml". *) Change: now the "gzip_vary" directive turned on issues a "Vary: Accept-Encoding" header line for uncompressed responses too. *) Feature: now the "rewrite" directive does a redirect automatically if the "https://" protocol is used. *) Bugfix: the "proxy_pass" directive did not work with the HTTPS protocol; the bug had appeared in 0.6.9.

--- a/src/mail/ngx_mail_smtp_handler.c
+++ b/src/mail/ngx_mail_smtp_handler.c
@@ -506,7 +506,7 @@ ngx_mail_smtp_helo(ngx_mail_session_t *s
 
     s->smtp_helo.len = arg[0].len;
 
-    s->smtp_helo.data = ngx_palloc(c->pool, arg[0].len);
+    s->smtp_helo.data = ngx_pnalloc(c->pool, arg[0].len);
     if (s->smtp_helo.data == NULL) {
         return NGX_ERROR;
     }