Our company has a roughly 7,000 person email list of convention attendees that we have a one-time right to contact. That's well beyond our maximums in either CRM or Campaigns - is there a way that your company can help us deliver a one time message to this list without having to permanently upgrade our accounts?
We have an dedicated mass mail service named Zoho Campaigns, using which, you can send emails to n number of contacts at a time and track the number of emails opened, bounced, delivered status along with the Geo map location to see from where your emails were opened and more.
If you wish to send one time message, we suggest you to purchase Email Credits(Pay-As-You-Go model) only when you need them, based on the number of emails that you want to send. please refer the below link for more information: