Quanah Gibson-Mount:
> We recently deployed into AWS, and were following
> <https://www.agari.com/scaling-postfix-on-aws-with-elastic-load-balancing/>.
>
> However, we found that if we set postscreen_upstream_proxy_protocol=haproxy
> we are then no longer able to connect directly to the MTAs to send mail.
Unlike XCLIENT, which sends information AFTER the SMTP handshake,
HaProxy cannot be used in mixed mode, because it sends information
BEFORE the SMTP handshake.
How would Postfix know that the client wants to send HaProxy
information before the SMTP handshake? If it could predict the
future, then I would be rich.
Wietse
> Is there any ability to support a mixed mode, where some clients are coming
> in via an upstream proxy and some are not?
>
> --Quanah
>
> --
>
> Quanah Gibson-Mount
> Platform Architect
> Manager, Systems Team
> Zimbra, Inc.
> --------------------
> Zimbra :: the leader in open source messaging and collaboration
> A division of Synacor, Inc
>
