freebsd下安装配置完dovecot后，启动dovecot提示以下错误信息：
Error: mail_executable: Can’t use /usr/local/libexec/dovecot/managesieve: No such file or directory
Fatal: Invalid configuration in /usr/local/etc/dovecot.conf
Error: mail_executable: Can’t use /usr/local/libexec/dovecot/managesieve: No such file or directory
Fatal: Invalid configuration in /usr/local/etc/dovecot.conf
Error: mail_executable: Can’t use /usr/local/libexec/dovecot/managesieve: No such file or directory
Fatal: Invalid configuration in /usr/local/etc/dovecot.conf
usage: install [-bCcpSsv] [-B suffix] [-f flags] [-g group] [-m mode]
[-o owner] file1 file2
install [-bCcpSsv] [-B suffix] [-f flags] [-g group] [-m mode]
[-o owner] file1 … fileN directory
install -d [-v] [-g group] [-m mode] [-o owner] directory …
install: -m: Invalid argument
/usr/local/etc/rc.d/dovecot: WARNING: failed precmd routine for dovecot
vi编辑dovecot.conf文件：
vi /usr/local/etc/dovecot.conf
修改：
protocols = imap pop3 imaps pop3s managesieve
为：
protocols = imap pop3 imaps pop3s
然后重新启动dovecot即可：
/usr/local/etc/rc.d/dovecot start
OK！