Terms of Service & Acceptable Use
Last Updated: October 21, 2026 • Applicable to All MailZentra Accounts & Subscriptions
1. User Accounts & Fair Use Limits
By accessing or creating an account on MailZentra, you agree to comply with our tier-specific fair use sending allowances:
- Free Sandbox: 1 connected mailbox, up to 100 verification queries / day.
- Growth Pro: 15 connected mailboxes, up to 3,500 daily pooled emails, unlimited dynamic jitter peer connections.
- Business Scale: 50 connected mailboxes, up to 15,000 daily pooled emails with Golang Turbo dispatch access.
- Agency Enterprise: Custom dedicated IP clusters and custom contracted SLA volumes.
2. Acceptable Use Policy (AUP) — Zero-Tolerance Rules
All customer campaigns must adhere to the following mandatory standards:
- Verified B2B recipients only with valid physical business address in footers.
- Functional one-click opt-out mechanisms processed without obstruction.
- No purchased unverified scrape dumps with bounce rates exceeding 2.0%.
3. Billing, Renewals, & 20% Annual Discount Terms
Subscriptions renew automatically on a recurring monthly or annual billing cycle. Annual subscriptions receive a mandatory 20% discount applied at checkout. You may cancel your subscription at any time via the billing portal at app.mailzentra.com, which prevents further billing cycles.
4. Service Level Agreement (SLA) & Infrastructure Uptime
We commit to maintaining a 99.9% uptime availability for our Golang Turbo microservice daemon and SMTP relay endpoints. In the event of scheduled maintenance or emergency security patching, customer campaigns are safely paused in-flight without burning sender reputations.