The "Volume Cap" Reality
Google and Outlook have strict sending limits.
Hard Limit: ~2,000/day (Google Workspace).
Safe Limit: 50/day (Cold Email Best Practice).
If you send more than 50 cold emails/day from one account, you exponentially increase the risk of being flagged as spam.
The Math of Horizontal Scaling
To send 500 emails/day, you have two choices:
Choice A (Vertical - Dangerous):
1 Email Account sending 500 emails.
Result: Account burns out in 1 week. Deliverability hits 0%. Revenue stops.
Choice B (Horizontal - Safe):
10 Email Accounts sending 50 emails each.
Result: Each account stays safe under the radar. Total volume = 500. Consistent revenue.
SendScale's Role
This is why SendScale allows Unlimited Email Accounts on paid plans. We encourage you to add more accounts (Domains/Personas) rather than trying to squeeze more volume out of a single inbox.
Cost: 10 Domains ($150/yr) + 10 Inboxes ($50/mo) is a tiny cost compared to the revenue of 1 closed deal.