Configuring proxy for email server

Help!
1

Hi,

I want to make imap/pop3/smtp proxy communication to the mail server.
I can’t do it with the current configuration. see below config
when trying to connect the email client, I receive information:

The IMAP server does not support the selected authentication method. Please change 'Authentication method' in the account settings email client

I tried various combinations, but I could not connect the client even with one of them. If I connect the client outside of HAproxy to the mail server, it works for me.

config:

global
    log stdout format raw local0 debug
    log 127.0.0.1:514 local0
    log 127.0.0.1:514 local1 info
    log 127.0.0.1:514 local2 notice
    maxconn                 100000
    chroot      /var/lib/haproxy
    user        haproxy
    group       haproxy
    daemon
    stats socket /var/run/haproxy.stat
    ssl-default-bind-options no-sslv3 no-tlsv10 no-tlsv11 no-tls-tickets
    ssl-default-bind-ciphers ECDH+AESGCM:DH+AESGCM:ECDH+AES256:DH+AES256:ECDH+AES128:DH+AES:RSA+AESGCM:RSA+AES:!aNULL:!MD5:!DSS
    ssl-default-server-options no-sslv3 no-tlsv10 no-tlsv11 no-tls-tickets
    ssl-default-server-ciphers ECDH+AESGCM:DH+AESGCM:ECDH+AES256:DH+AES256:ECDH+AES128:DH+AES:RSA+AESGCM:RSA+AES:!aNULL:!MD5:!DSS
    tune.ssl.default-dh-param 2048
defaults
    mode                    http
    log                     global
    option                  httplog
    option                  dontlognull
    option                  redispatch
    retries                 3
    timeout http-request    10s
    timeout queue           1m
    timeout connect         10s
    timeout client          15m
    timeout server          15m
    timeout http-keep-alive 10s
    timeout check           10s

listen ststs
        bind *:444 ssl crt /certs/ssl-bundle.pem 
        mode http
        stats enable
        stats refresh 600s
        stats show-legends
        stats show-node
        stats hide-version
        stats uri /stats

frontend fe_exchange_smtp
    mode tcp
    option tcplog
    bind *:465 name smtp ssl crt /certs/ssl-bundle.pem
    default_backend be_exchange_smtp

backend be_exchange_smtp
    mode tcp
    balance roundrobin
    option log-health-checks
    server exchange1 server1:25 weight 10 check
    server exchange2 server2:25 weight 20 check

frontend fe_exchange_pop3
    mode tcp
    option tcplog
    bind *:995 name pop3 ssl crt /certs/ssl-bundle.pem
    default_backend be_exchange_pop3

backend be_exchange_pop3
    mode tcp
    balance leastconn
    option log-health-checks
    server exchange1 server1:110 weight 10 check
    server exchange2 server2:110 weight 20 check

frontend fe_exchange_imaps
    mode tcp
    log global
    option tcplog
    bind *:993 name imaps ssl crt /certs/ssl-bundle.pem
    default_backend be_exchange_imaps

backend be_exchange_imaps
    mode tcp
    log global
    balance leastconn
    option log-health-checks
    server exchange1 server1:143 weight 10 check
    server exchange2 server2:143 weight 20 check

in log stdout I see this

00000010:fe_exchange_imaps.accept(0007)=000e from [client:57732] ALPN=<none>
00000011:fe_exchange_imaps.accept(0007)=0011 from [client:57733] ALPN=<none>
00000010:be_exchange_imaps.srvcls[000e:adfd]
00000010:be_exchange_imaps.clicls[000e:adfd]
00000010:be_exchange_imaps.closed[000e:adfd]
client:57732 [05/Jun/2024:09:31:48.448] fe_exchange_imaps~ be_exchange_imaps/exchange1 10/1/211 176 -- 2/2/1/0/0 0/0
00000011:be_exchange_imaps.srvcls[0011:adfd]
00000011:be_exchange_imaps.clicls[0011:adfd]
00000011:be_exchange_imaps.closed[0011:adfd]
client:57733 [05/Jun/2024:09:31:48.449] fe_exchange_imaps~ be_exchange_imaps/exchange2 15/1/211 176 -- 1/1/0/0/0 0/0
00000012:fe_exchange_imaps.accept(0007)=000e from [client:57734] ALPN=<none>
00000013:fe_exchange_imaps.accept(0007)=0011 from [client:57735] ALPN=<none>

Thanx for Helping