notify*.dropbox.com单独翻墙，dnsmasq或者unbound把dropbox的其它域名让dnscrypt解析，可解。
#unbound参考配置，dnscrypt开在127.0.0.2地址，本机dns设为127.0.0.1#
server:
verbosity: 0
interface: 127.0.0.1
do-not-query-localhost: no
prefetch: yes
do-ip4: yes
do-ip6: no
do-udp: yes
do-tcp: yes
tcp-upstream: yes
forward-zone:
name: "."
forward-addr: 114.114.114.114
forward-addr: 114.114.115.115
forward-zone:
name: "
dropbox.com"
forward-addr: 127.0.0.2@53
forward-zone:
name: "
dropboxdocs.com"
forward-addr: 127.0.0.2@53
forward-zone:
name: "
dropboxmail.com"
forward-addr: 127.0.0.2@53
forward-zone:
name: "
dropboxteam.com"
forward-addr: 127.0.0.2@53
forward-zone:
name: "
dropboxstatic.com"
forward-addr: 127.0.0.2@53
forward-zone:
name: "
dropbox.zendesk.com"
forward-addr: 127.0.0.2@53
forward-zone:
name: "
dropboxforums.com"
forward-addr: 127.0.0.2@53
forward-zone:
name: "
dropboxforum.com"
forward-addr: 127.0.0.2@53
forward-zone:
name: "
carousel.com"
forward-addr: 127.0.0.2@53
forward-zone:
name: "
mailboxapp.com"
forward-addr: 127.0.0.2@53
forward-zone:
name: "
db.tt"
forward-addr: 127.0.0.2@53
forward-zone:
name: "
dropboxusercontent.com"
forward-addr: 127.0.0.2@53
forward-zone:
name: "
cloudflare.net"
forward-addr: 127.0.0.2@53
forward-zone:
name: "
amazonaws.com"
forward-addr: 127.0.0.2@53