How to prevent, or change priority, of dovecot's FAILed relay-submission to relay's IPv6 address, and submit ONLY/first to IPv4?

[justina colmena ~biz]

On Friday, April 9, 2021 5:19:20 AM AKDT PGNet Dev wrote:
> And it's a bad assumption that since the host is dual-stack that all
> services on it will be.

That's right. Email stuff that's supposed to work has to be crippled and 
disabled somehow so that it does not actually work as it is supposed to.

There's a knob to tweak to break someone's mailbox for a party prank, cut off 
a service if it isn't immediately obvious how it's affecting someone else's 
work, or screw something else up so it can't or doesn't work reliably, either.
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