Revert "[REF] Update Zetacomponents/mail to be 1.9.5 to fix email validation handling" #27394
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This reverts commit 020a117.
Let's re-visit in master cos this turns out to be a bit more complicated see zetacomponents/Mail#90
There was no particular driver for this to be in 5.66 - it just got pulled in cos I successfully prodded the upstream merger to merge it. So let's slow it down & worry about it in master
Note that the other email bounce processor work is unrelated