Can limit on outgoing mail (from Creator sendmail) be raised from 500 to 2000?

Can limit on outgoing mail (from Creator sendmail) be raised from 500 to 2000?

My org's mailing list is currently 2000 email addresses, and growing.  But I can't send more than 500 per day from Zoho.  This seems like a very low limit for any organization using Zoho Creator for a contacts database.  How can the limit be raised to higher numbers?

Please advise.  Thanks.

Greg Malone
Santa Fe, New Mexico, US