error with imap_open

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i'm getting a very strange behaviour with imap_open.
My code does:
$stream = imap_open(":110/pop3}INBOX",
$_SESSION["user"], $_SESSION["pass"]);
then checks if that stream is valid...
well, this code seems to work on some pop3 servers...
on some servers, if($stream) evaluates to false and imap_error prints
"Can not authenticate to POP3 server: POP3 connection broken in response"
However i'm pretty sure authentication works, because using wrong
user/pass results in the proper wrong user/pass error.
Does anybody know what's happening?

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