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

[PGNet Dev]

> then the software is entirely correct in deciding to use any of those addresses in whatever order it wants. 

Complete and utter malarkey.

But believe what you like.

Might wanna READ the code before going on about the "additional burden"

http://dovecot.2317879.n4.nabble.com/how-to-set-smtp-client-gt-submission-relay-host-for-IPv4-only-td72077.html#a72097