zendframework/zf2 — pull request #4312 by colun (2013-04-25 03:46:19+00:00)
Title: POP3 protocol "return;" is needed after APOP request

"return;" existed before Apr 30, 2012(not inclusive). However, "return;" was erased in Apr 30, 2012. I think it is human error. "return;" is needed in POP3 protocol.