ptejada/uFlex — pull request #22 by Rillke (2014-11-25 20:14:14+00:00)
Title: Accept some new gTLD e-Mail addresses

by allowing longer TLDs (up to 63 characters, which is the DN maximum: https://tools.ietf.org/html/rfc1034):
"Each node has a label, which is zero to 63 octets in length."

For an up-to-date-length, see http://stackoverflow.com/a/22038535