We are currently running Version: 15.1.3.3.
We received a help-desk ticket today that indicated the user could not send a file because the recipients email address is not valid. After testing we found that any domain with TLD 5 or more characters will appear as RED and when moving to the next page a message pops up: "Please correct all errors within this form before moving onto the next page."
Longer TLDs are normal these days and the "group" TLD is definitely in use.
e.g.
FAIL: some.name@some-domain.group
GOOD: test@good.dog
FAIL: test@bad.dragon
GOOD: test@good.lion
GOOD: test@good.io
I'm wondering if anyone else has seen this and if this is resolved in the newest version 15.1.6.25.