I believe you actually require the INBOX attribute as well.
$mbox = imap_open ("{mail.hot.ee:110/pop3}INBOX", "pop3testing", "testing");
if you still have problems you might also try (explictly request non-SSL connection):
$mbox = imap_open ("{mail.hot.ee:110/pop3/notls}INBOX", "pop3testing", "testing");
Hope that helps.
-- Jason k Larson
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