mass mailing problem

[artpapa]

I tried to send VB mass mailing,
I set Email to send at once to 50,
I have over 6000 users but on the user number 2111 server is freeze (Stop responding).
customer service answer that: "We have a limit of sending mails on the server. The maximum number of emails that a domain can send per hour is 1000.
If you need to send more emails, make sure that you use some kind of batch process to put a delay between emails."
Is there any opportunity to make delay between emails?
thanks
Alexei