On Hotmail block list

[subscriptions78]

I sent an email to a Hotmail address and it was returned undelivered with message
"Connected to 65.55.92.184 but sender was rejected.
Remote host said: 550 SC-001 Unfortunately, messages from 173.236.28.162 weren't sent. Please contact your Internet service provider since part of their network is on our block list. You can also refer your provider to http://mail.live.com/mail/troubleshooting.aspx#errors."

[descalzo]

Known issue due to people using their Free accounts to spam. x10hosting monitors and suspends them, but the damage has been done.

Alternative is to set up a Google Apps account for your domain and then activate email on it (use cPanel to edit MX records) and then us PHPMailer or a similar script to send your script based emails through Google Apps via SMTP