fatal: bad string length 0 < 1: ......

发送邮件给本地虚拟域:[已解决]
错误提示：
Sep 21 11:26:36 localhost postfix/qmgr[3784]: EE5FD148FA5: from=, size=503, nrcpt=1 (queue active)
Sep 21 11:26:36 localhost postfix/virtual[3788]: fatal: bad string length 0 < 1: virtual_mailbox_base =
Sep 21 11:26:37 localhost postfix/master[3780]: warning: process /usr/libexec/postfix/virtual pid 3788 exit status 1
Sep 21 11:26:37 localhost postfix/master[3780]: warning: /usr/libexec/postfix/virtual: bad command startup -- throttling

解决方法：
修改main.cf

增加：
virtual_transport = maildrop:
maildrop_destination_recipient_limit = 1