Pricing
Simple, transparent pricing.
Pay per mailbox, not per message. No overages, no surprises, no hidden fees.
Starter
For small acquisitions
$3 /mailbox/mo
- Up to 500 mailboxes
- Outbound rewriting
- Header + ICS rewriting
- DKIM re-signing
- Self-service portal
- Email support
MOST POPULAR
Business
For mid-market M&A
$5 /mailbox/mo
- Up to 5,000 mailboxes
- Outbound + inbound rewriting
- Per-sender overrides
- Directory sync (Entra ID / Google)
- Rewrite simulator
- Priority support + SLA
Enterprise
For large-scale integrations
Custom
- Unlimited mailboxes
- Multi-domain rewriting
- Dedicated infrastructure
- SSO / SAML federation
- Custom SLA
- Dedicated account manager
All plans include a 14-day free trial · Annual billing saves 20% · No credit card required to start
Frequently asked questions
What counts as a mailbox?
Any unique sender address that passes through PostMerge. Shared mailboxes and distribution lists each count as one mailbox.
Is there a free trial?
Yes. Every plan includes a 14-day free trial with full functionality. No credit card required to start.
What happens if I exceed my mailbox limit?
We'll notify you and give you time to upgrade. We never stop rewriting mid-flow — your email delivery is never interrupted.
Can I switch plans?
Absolutely. Upgrade or downgrade at any time. Changes are prorated to the day.
Do you offer annual billing?
Yes. Annual plans receive a 20% discount. Contact us for details.