- Caps you cannot raise
- Every mailbox has a daily limit derived from its age and its health. There is no field, flag or support ticket that lifts it. To send more, you add mailboxes — we tell you how many.
- Verification you cannot skip
- No email leaves for an address that has not come back valid. Not as a default you can turn off. As a rule.
- Warming you cannot buy past
- Real mail to real recipients on a fixed curve, measured against seed accounts we run ourselves. No peer pool, because a pool measures itself.
- Numbers that are true when they are bad
- Complaint rate over 0.08% pauses the mailbox and the campaign. You will find that annoying exactly once.
