QMail SMTP backends in haproxy

@moscardo wrote:

Hi,
I am setting up haproxy in front of several Qmail SMTP servers, however when I try to send an email through Thunderbird, it doesn’t really work.

The message could not be sent because connecting to Outgoing server (SMTP) smtp.example.com failed. The server may be unavailable or is refusing SMTP connections. Please verify that your Outgoing server (SMTP) settings are correct and try again.

But if I try to send it through telnet I do get the email but just blank email, with no sender , body…

Any idea what could be happening ?

This is the config:

frontend smtp_service_front
  bind 10.11.6.39:25
  mode tcp
  default_backend smtp_service_back
  description SMTP 25 Service
  log global
  maxconn 8000
  option socket-stats
  option tcplog
  option tcpka
  timeout client 30s

backend smtp_service_back
  mode tcp
  balance roundrobin
  option tcpka
  option smtpchk HELO smtp.example.com
  timeout connect 5s
  timeout server 31s
  server lxmail01-vm mail01.example.com:25 resolvers dns resolve-prefer ipv4 fall 4 rise 3 inter 2s   check-send-proxy send-proxy check
  server mail03 mail03.example.com:25 resolvers dns resolve-prefer ipv4 fall 4 rise 3 inter 2s check-send-proxy send-proxy check

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