Hello,
We have set a limit of 200 outgoing emails per hour on shared and reseller hosting, 500 outgoing emails per hour on VPS Hosting, 1000 outgoing emails per hour on Semi Dedicated Hosting and 3600 outgoing emails per hour on Dedicated Hosting to avoid any sort of email spamming from our servers. Customers cannot send more than the specified number of emails in an hour irrespective of the size of their mailing lists.
You can send upto 86,400 outgoing email with our Dedicated Server in 24 hours time. Please refer to the below link for more details.
Dedicated Server - Dedicated Servers - Web Hosting UK
Thank you