我的 Mailcow 实例出现了奇怪的问题。一个容器（Postfix）已开始部分解析 DNS。问题只出在这个特定的容器上，我不明白。由于错误，它导致电子邮件无法从中发送domain name not found。
root@6c751ea397ad:/# host wp.pl
Host wp.pl not found: 2(SERVFAIL)
root@6c751ea397ad:/# host mx.wp.pl
Host mx.wp.pl not found: 2(SERVFAIL)
root@6c751ea397ad:/# cat /etc/resolv.conf
search domain.com
nameserver 127.0.0.11
options ndots:0
但使用外部 DNS：
root@6c751ea397ad:/# host wp.pl 1.1.1.1
Using domain server:
Name: 1.1.1.1
Address: 1.1.1.1#53
Aliases:
wp.pl has address 212.77.98.9
wp.pl mail is handled by 0 mx.wp.pl.
wp.pl mail is handled by 5 mx5.wp.pl.
对于不同的域：
root@6c751ea397ad:/# host -t any o2.pl
o2.pl has address 212.77.98.29
o2.pl descriptive text "facebook-domain-verification=0omejgqroqocgh4efgrbu8bovlazni"
o2.pl descriptive text "v=spf1 include:wp.pl -all"
o2.pl mail is handled by 10 mx.tlen.pl.
o2.pl has SOA record ns1.go2.pl. root.go2.pl. 2020111002 3600 1080 1209600 7200
o2.pl name server ns1.go2.pl.
o2.pl name server ns2.go2.pl.
root@6c751ea397ad:/# host -t any mx.tlen.pl
mx.tlen.pl has address 193.222.135.150
这个真的很奇怪：
root@6c751ea397ad:/# host -t any company.mail.protection.outlook.com
Host company.mail.protection.outlook.com not found: 2(SERVFAIL)
root@6c751ea397ad:/# host -t any outlook.com
outlook.com has SOA record bn7mgt0101dc013.prdmgt01.prod.exchangelabs.com. msnhst.microsoft.com. 2014796278 300 900 2419200 60
outlook.com has address 40.97.148.226
outlook.com has address 40.97.153.146
outlook.com has address 40.97.161.50
...
每个其他容器都运行良好：
root@c228923398e8:/# host wp.pl
wp.pl has address 212.77.98.9
wp.pl mail is handled by 5 mx5.wp.pl.
wp.pl mail is handled by 0 mx.wp.pl.
root@c228923398e8:/# host mx.wp.pl
mx.wp.pl has address 212.77.101.4
root@c228923398e8:/# cat /etc/resolv.conf
search domain.com
nameserver 127.0.0.11
options ndots:0
我到目前为止已经尝试过：
resolvconf从主机中删除并重新安装- 将 1.1.1.1/8.8.8.8 添加到
/etc/resolvconf/resolv.conf.d/base和/etc/resolvconf/resolv.conf.d/head - 将 DNS 添加到：
/etc/docker/daemon.json - 向 mailcow docker-compose 添加静态 DNS
- 禁用防火墙
一切都毫无进展。