Hi,I think the biggest issue with those is that qmail is really dated, the configuration of the other two is considered difficult and such a setup likely requires multiple external milters to function properly/securely, but quite a few commonly used milters for that purpose are unmaintained and/or buggy.
Take a look at Stalwart, Maddy or if you need something more battle-tested (and known to scale, we have /some/ affiliation), WildDuck and Haraka. Most of these have built-in support for MTA-STS, DMARC, DKIM, ARC and so forth and are actively maintained.
Regards
smime.p7s
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