imap_open authentication failure

Hi, I'm using the following code: $x = imap_open("{mail.xxxx.com:110/pop3}INBOX", "xxxx@xxxx.com", "xxxx"); echo $x ? "YAY!" : "NO YAY!<BR>" . implode("<BR>", imap_errors()); It works fine on my local server, but as soon as I try it on the live machine it gives me: Retrying CRAM-MD5 authentication after Retrying CRAM-MD5 authentication after Invalid userid/password Retrying CRAM-MD5 authentication after illegal command Retrying CRAM-MD5 authentication after authentication exchange failed Can not authenticate to POP3 server: authentication exchange failed Which is just mean, the local server is Debian 2.2 running PHP 4.0.3pl1 and the live one is Slackware 8.1-rc1 running PHP 4.2.1. The mail server seems to identify itself as IMail 6.02. The live server can telnet into the mail server okay so it's not a connection problem and it can connect to different mail servers without problems. After extensive googling I found something in Norwegian which I guessed was saying to try replacing the "@" in the login to "\$", which was tried... as before, worked locally but failed live. So I gave up and decided to leave it to better minds than mine, ie. you. Thanks in advance.