One major advantage of using ASMTP with our services is that you can travel with your computer from ISP to ISP or around the world and not have to worry about constantly re-configuring your Outgoing Mail server to that of the ISP your connected (which is normal practice).
In short, Authenticated sending (ASMTP) allows you to use us as not only your Incoming (POP3) mail server, but also as your Outgoing (SMTP) mail server, by basically having your mail program give your same login/password each time you send just as you receive. This allows you to travel the world on any Internet connection, and freely send mail through our systems without change of configuration, or hassle.
ISP Port Blocking: Some ISP's like Mindspring and SBC Global (Feb/2005) started doing a flat out port blocking on all their customers filtering their Internet connections. This removes your choice to use ASMTP/SMTP mail servers of your web/domain provider and forces you to use their server as your outgoing mail server (only effecting outbound mail), removing your freedom of choice. You can generally get around this, however, by changing your mail port to '587' instead of the default '25'. To learn how to do this, click the mail program you are using on the left-hand toolbar. In extreme cases where SMTP is being filtered AND you can't use Port 587, you will be required to use your ISP's SMTP (Outgoing) mail server.