我使用 Vesta 控制面板，Exim 搞砸了，更新后出错。
2020-12-03 23:45:35 H=mail-wr1-f44.google.com [209.85.221.44] X=TLS1.2:ECDHE-RSA-AES128-GCM-SHA256:128 CV=no F=<mymail@gmail.com> temporarily rejected RCPT <info@my.com>: failed to expand "${extract{1}{:}{${lookup{$local_part@$domain}lsearch{/etc/exim/domains/$domain/aliases}}}}": NULL
沿途有符号链接。如何缩小？/etc/exim/domains/$domain/aliases