As a GroupMail user, you can connect to any outgoing SMTP mail server that you have access to. This can be the SMTP mail server of your ISP, web hosting company, a free SMTP server such as Gmail or your own SMTP server (if you have one.)

Most SMTP mail hosts will have limits on how many messages you can process through their server each hour or day. The Gmail SMTP server, for example, allows users to send 100-150 emails per day when connecting remotely to it. Comcast allows residential customers to send 1,000 messages per day. Comcast Business customers can send 24,000 emails per day.

If your SMTP mail server does not support your list size or sending frequency, here are some options:

1. Contact the host of your SMTP server and ask if they have a business account (like Comcast) which would allow you to send more emails per hour or day.
2. Use GroupMail’s Direct Send Mode, which allows you to bypass your SMTP server altogether and send messages directly from your computer to your recipients. **
3. Use a secondary SMTP server such as AuthSMTP, SMTP2Go or SocketLabs and route your messages through that secondary SMTP server.
4. Find a web hosting company that has daily mail sending limits which meet your requirements.

* Direct Send mode requires that your ISP has Port 25 open and that you are sending from a Static IP address.

So, while in GroupMail you can create email lists of any size, the success of delivery to large groups is dependent upon the SMTP mail server that you are routing your messages through (or the access to Port 25 and a fixed or static IP required for direct sending.)