I will second or third this (as if I have a say).
Email is turning into a nightmare for our project, partly our own design, we had people submit their emails into a google form because they had to enter two other addresses they would be grouped with.
We have malformed emails, emails with typos etc, but once we cleaned all those, well it seems like 60% of our recipients are having the emails flagged as spam (and if you work with general non techie folks, maybe 10% might know where to look).
It would help us a lot to message people an invite link, even ok to add a shorter expiry time stamp.
Thanks discoursers!