Cablevision / Optimum does NOT allow customers to send emails using an email client program or SMTP mail server, unless the customer subscribed to "Optimum Online Boost" or "Optimum Online for Business".
- Cablevision/Optimum (OOL) email send limit - maximum 50 recipients at one time
- Cablevision other SMTP limits - max 20mb per outgoing message
- Cablevision/Optimum email-outbound policy - http://www.optimum.net/Article/Terms
- Cablevision SMTP restriction expiry method - N/A.