I don't understand this. What does it mean to point traffic (from
the internet? from the local network?) to a load balancer for LAN
(from the LAN? to the LAN?) or WAN (from the WAN? to the WAN?)
traffic.

Postfix supports load balancers for receiving mail. Postfix does not
support load balancers for sending mail.
By "point" I meant via DNS addressing. I see what you're saying now, though, it's only for incoming traffic.
As I wrote a Postfix SMTP server process can receive mail from
an SMTP client and through nginx/XCLIENT.
Thank you, I understand now.
Do either of these options affect SMTP authentication over port 587?
HAproxy does not interfere with SMTP AUTH, it just passes bits.

You want to disable nginx SMTP AUTH support so that Postfix will
do it. nginx can do SMTP AUTH but that is only good for logging.
Excellent, thank you.

--
Asai

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