Here is what I get executing example.php:
gmail-smtp-in.l.google.com: A connection attempt failed because the connected component did not respond correctly after a period of time, or a connection failed because the connected host did not respond.
alt1.gmail-smtp-in.l.google.com: (the same message)
alt2.gmail-smtp-in.l.google.com: (the same message)
alt3.gmail-smtp-in.l.google.com: (the same message)
alt4.gmail-smtp-in.l.google.com: (the same message)
All connection fails
email <
[email protected]> valid, but not exist!