我尝试通过haproxy将所有传入的电子邮件stream量代理到我的debian服务器中的mailcow-dockerized解决scheme：
haproxy.cfgconfiguration是：
global log /dev/log local0 log /dev/log local1 notice chroot /var/lib/haproxy stats socket /run/haproxy/admin.sock mode 660 level admin stats timeout 30s user haproxy group haproxy daemon # Default SSL material locations ca-base /etc/ssl/certs crt-base /etc/ssl/private # Default ciphers to use on SSL-enabled listening sockets. # For more information, see ciphers(1SSL). This list is from: # https://hynek.me/articles/hardening-your-web-servers-ssl-ciphers/ ssl-default-bind-ciphers ECDH+AESGCM:DH+AESGCM:ECDH+AES256:DH+AES256:ECDH+AES128:DH+AES:ECDH+3DES:DH+3DES:RSA+AESGCM:RSA+AES:RSA+3DES:!aNULL:!MD5:!DSS ssl-default-bind-options no-sslv3 defaults log global mode http option httplog option dontlognull timeout connect 5000 timeout client 50000 timeout server 50000 errorfile 400 /etc/haproxy/errors/400.http errorfile 403 /etc/haproxy/errors/403.http errorfile 408 /etc/haproxy/errors/408.http errorfile 500 /etc/haproxy/errors/500.http errorfile 502 /etc/haproxy/errors/502.http errorfile 503 /etc/haproxy/errors/503.http errorfile 504 /etc/haproxy/errors/504.http frontnend smtp bind *:25 default_backend smtp_public frontend submission bind *:587 default_backend smtp_submission frontend smtp_ssl bind *:449 default_backend smtp_ssl frontend pop3 bind *:995 default_backend pop3_ frontend imap bind *:993 default_backend imap backend smtp_public mode tcp option tcplog server docker 127.0.0.1:2525 check backend smtp_ssl mode tcp option tcplog server docker 127.0.0.1:2465 backend smtp_submission mode tcp option tcplog server docker 127.0.0.1:2587 backend pop3_ mode tcp option tcplog server docker 127.0.0.1:2995 backend imap mode tcp option tcplog server docker 127.0.0.1:2993
而运行的图像是：
ec79939443d4 mailcow/acme:1.3 "/srv/docker-entry..." 46 hours ago Up 46 hours 29c295d44767 mailcow/rspamd:1.1 "/docker-entrypoin..." 46 hours ago Up 46 hours 2d09fd009c39 nginx:mainline-alpine "/bin/sh -c 'envsu..." 46 hours ago Up 46 hours (healthy) 80/tcp, 0.0.0.0:8080->8080/tcp a00d9477c464 mailcow/fail2ban:1.0 "python2 -u /logwa..." 46 hours ago Up 46 hours 6fdf54789459 mailcow/phpfpm:1.0 "/docker-entrypoin..." 46 hours ago Up 46 hours 9000/tcp 091d621123aa mailcow/sogo:1.0 "/bin/sh -c 'exec ..." 46 hours ago Up 46 hours 1028c60923a0 redis:alpine "docker-entrypoint..." 46 hours ago Up 46 hours 6379/tcp 827c20cee898 mailcow/dovecot:1.0 "/docker-entrypoin..." 46 hours ago Up 46 hours 24/tcp, 10001/tcp, 0.0.0.0:2110->110/tcp, 0.0. 76a977a8064e mailcow/postfix:1.0 "/bin/sh -c 'exec ..." 46 hours ago Up 46 hours 588/tcp, 0.0.0.0:2525->25/tcp, 0.0.0.0:2465->4 2299076f475f memcached:alpine "docker-entrypoint..." 46 hours ago Up 46 hours 11211/tcp 03b56dcc1563 mailcow/unbound:1.0 "/docker-entrypoin..." 46 hours ago Up 46 hours (healthy) 53/tcp, 53/udp 21f5a3673f3f mariadb:10.1 "docker-entrypoint..." 46 hours ago Up 46 hours (healthy) 3306/tcp e2af96428a94 robbertkl/ipv6nat "/docker-ipv6nat -..." 46 hours ago Up 46 hours 97fcf9ad82ad mailcow/clamd:1.0 "/bootstrap.sh" 46 hours ago Up 46 hours 3310/tcp
但是我得到以下错误：
Ιούλ 04 17:28:51 DockerMailserver haproxy[58310]: [ALERT] 184/172851 (58310) : Unable to use proxy 'imap' with wrong mode, required: http, has: tcp. Ιούλ 04 17:28:51 DockerMailserver haproxy[58310]: [ALERT] 184/172851 (58310) : You may want to use 'mode http'. Ιούλ 04 17:28:51 DockerMailserver haproxy[58310]: [ALERT] 184/172851 (58310) : Proxy 'imap': unable to find required default_backend: 'imap'. Ιούλ 04 17:28:51 DockerMailserver haproxy[58310]: [ALERT] 184/172851 (58310) : Fatal errors found in configuration. Ιούλ 04 17:28:51 DockerMailserver systemd[1]: haproxy.service holdoff time over, scheduling restart. Ιούλ 04 17:28:51 DockerMailserver systemd[1]: Stopping HAProxy Load Balancer... Ιούλ 04 17:28:51 DockerMailserver systemd[1]: Starting HAProxy Load Balancer... Ιούλ 04 17:28:51 DockerMailserver systemd[1]: haproxy.service start request repeated too quickly, refusing to start. Ιούλ 04 17:28:51 DockerMailserver systemd[1]: Failed to start HAProxy Load Balancer. Ιούλ 04 17:28:51 DockerMailserver systemd[1]: Unit haproxy.service entered failed state.
你们有没有想法如何解决这个错误？
根据文档，可以在所有部分（ backend ， frontend ， defaults ， listen ）上设置模式。 你有一个defaults部分mode http 。 这可以适用于没有指定模式的frontend部分？
尝试为使用mode tcp使用后端的前端指定mode tcp 。