Leap days, February 29th, are not at the level of time zones. Different time zones do not disagree as to when March 1st will occurs immediately after February 28th.
Error
The address "test@[«redacted»]" in the "To" field was not recognized.
Please make sure that all addresses are properly formed.
This address doesn't have an MDA listening on it, but it didn't accept it enough to give me a non-delivery notification, it didn't even let me send it. gmail did accept an IPv4 address literal in brackets, although it hasn't given me back a non-delivery notification. What it stuffed into my Sent folder for this message has the square brackets stripped and the IPv4 address appears right after the @.
I can be reached at hnthwarted (&) thwartedefforts (x) org
https://github.com/thwarted
#D5B390 #274e69 #FF9933 #7a8c96 #663399