we have a GW 2014 system, all working ok, except that we have a problem with IMAP and POP connectivitiy

POP and IMAP are enabled on the GWIA, IMAP also on the POA.

I can telnet on the default ports ( 110, 143, 25 ) into the server.

When setting up an POP client, I cannot authenticate. It does not accept the user and the password ( both are correct )

When setting up an IMAP client, I can authenticate on 143 and receive mails, but on 25 also the credentials are rejected.

I would appreciate help with that, thank you very much