Depending on the POP or IMAP server you may have to specify dotlock locking, which requires that the recipient UID or GID has write access to the parent directory of the mailbox file.

• 根据POP或IMAP服务器，还可以使用dotlock锁定方式，这种方式要求收件人的UID或GID对邮箱的上级目录有写权限。