Why can I send email using the BigBiz SMTP (outgoing email) server?
Many ISPs are now implementing a policy called Port 25 Blocking which will effectively limit your options for sending outgoing email. If your ISP has put into action this policy, you must send your outgoing email via the ISP’s SMTP server and not with the BigBiz SMTP server (mail.yourdomain.com). The Port 25 Blocking will block all attempts to access any other SMTP server other than the server that belongs to the ISP. Currently, the ISPs that have implemented this policy include MSN, Earthlink, and Verizon. Please refer to the BigBiz News page for updates.