Description:
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Cannot login to IMAP server without SSL (with not tested)

length of username or password must be: 12

then try to connect with imap_open()

$imap = imap_open("{127.0.0.1:143}INBOX", "any@mail.com", "aaaaaaaaaaaa");

Warning: imap_open() [function.imap-open]: Couldn't open stream {127.0.0.1:143}INBOX in /home/

BUT, if you set any other password length: 11 or 13 or 10 or any then all OK

$imap = imap_open("{127.0.0.1:143}INBOX", "any@mail.com", "abc");