On Tue, Feb 25, 2025 at 05:01:01PM +1100, duluxoz via Postfix-users wrote:

> Oh, and the HAProxy health check? The relevant lines in the HAProxy config
> file are/were:
> 
>     backend submission_server
> 
>         option smtpchk
> 
>         server mail mail.local:25587 check send-proxy-v2

Perhaps it sends a negative port number as a sentinel value?
Which would be an unfortunate choice, if that's the default.

-- 
    Viktor.
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