diff --git a/src/mail/ngx_mail_parse.c b/src/mail/ngx_mail_parse.c
index 2c2cdff..0712ad5 100644
--- a/src/mail/ngx_mail_parse.c
+++ b/src/mail/ngx_mail_parse.c
@@ -846,14 +846,14 @@
     for (p = s->buffer->pos; p < s->buffer->last; p++) {
         if (*p == LF) {
             s->state = sw_start;
-            p++;
-            break;
+            s->buffer->pos = p + 1;
+            return NGX_MAIL_PARSE_INVALID_COMMAND;
         }
     }
 
     s->buffer->pos = p;
 
-    return NGX_MAIL_PARSE_INVALID_COMMAND;
+    return NGX_AGAIN;
 }