XS4all (in Holland) is one of the few ISP's that still got all ports open (I also have XS4all)
Also.. Make sure that you have a working SPF record if you send mail to Yahoo and or Hotmail.. If you do not have this, the email will never arrive!
If you do have a SPF record, the email might (will) be in the 'bulk' mailbox, so have a look in there!
Did you try emailing to a non yahoo/hotmail email address? If not.. Give it a test.. Your email might work fine!
Last edited by edge; 26th April 2006 at 18:44.