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Up to 2 e-mail addresses with 25MB of total storage space allocated between them.
Preferred HSI accounts:
Up to 7 e-mail addresses with 100MB of total storage space allocated between them.
Premier HSI accounts:
Up to 10 e-mail addresses with 150MB of total storage space allocated between them.
Problems may occur if the file attached to an email is close to 10 MB in size because most e-mail programs will encode e-mail attachments so they can be properly sent. The encoding performed by the e-mail client program can make the e-mail including the attached file larger than allowed by Adelphia's servers, in which case the server will reject the e-mail.
At this time, ALL other mail server addresses Adelphia has previously used for customer e-mail accounts have now been redirected to that server, including the aliases "mail", "pop", and "smtp".
Web email access is also available for Adelphia's customers. To access your Adelphia e-mail account using a web browser, log-in at:
»webmail.adelphia.net (insecure log-in)
From a post by Hobgoblin
To send mail using Adelphia's outgoing (SMTP) email servers you must be using your cable modem connection provided by Adelphia or the webmail access at »www.adelphia.net .
Most other major ISPs also have similar "relay" blocking policies. The solution to this problem is to use the outgoing (SMTP) email server of the ISP you are using to connect to the internet.
See this Microsoft Knowledge Base Article for more information:
SMTP Relay Blocking Error Sending E-mail