If you are using the webmail interfaces to send messages, there is a limit of 100 recipients total in the To, Cc, and Bcc fields. This limit cannot be increased.
However, there are no limits on our end if you send e-mail through our SMTP server using a local mail application like Outlook, for example.
Another option to send a message to multiple recipients is to use mailing lists. They have been specifically designed to handle sending of a single message to many subscribers, and the number of recipients you send to is not limited. Mailing lists can be created via the Mailing Lists section of the Control Panel of the hosting account.