Compare — Transactional Email
gent.mx vs Transactional Email APIs
Transactional tools send. gent.mx also receives, stores, and acts.
Resend, Postmark, Mailgun, and SendGrid are excellent at sending high-volume transactional mail. Some also process inbound mail through webhooks or receiving rules. gent.mx fills a different role: persistent per-inbox records, contacts, search, approvals, and workflows around two-way email.
Resend Free / paid · Postmark Free / $15+/mo · Mailgun Free trial / $15+/mo · SendGrid Free / paid · AWS SES $0.10 / 1k emails
Feature comparison
| gent.mx | Resend | Postmark | Mailgun | SendGrid | AWS SES | |
|---|---|---|---|---|---|---|
| Price | From $5 / inbox / mo | Free / paid | Free / $15+/mo | Free / $15+/mo | Free / paid | $0.10 / 1k emails |
| Inbound processing | Persistent inbox | Inbound API/webhooks | Inbound webhook | Inbound routes | Inbound parse | Receiving rules |
| Persistent inbox (read/search) | Yes | Sent/received APIs | Message search | Message retention | Webhook payloads | Object actions |
| Per-inbox isolation | Yes | Domain-level | Domain-level | Domain-level | Domain-level | Domain-level |
| Send mail | Yes | Yes | Yes | Yes | Yes | Yes |
| Contacts & CRM API | Yes | Contacts API | No | No | No | No |
| Workflow rules | Inbox-native | Automations/webhooks | Webhook based | Routes/webhooks | Webhook based | Rules/actions |
| Email sequences | Yes | Not core | No | No | No | No |
| AI enrichment | Yes | AI features/examples | No | No | No | No |
| Agent-oriented controls | Yes | Agent examples/integrations | No | No | No | No |
| Delivery analytics | Audit log | Delivery analytics | Delivery analytics | Delivery analytics | Delivery analytics | CloudTrail / logs |
| Data residency | Tenant region controls | Multi-region | Not clear | Regional options | Not clear | Choose region |
When gent.mx is the right choice
- Transactional APIs are the right tool for high-volume notifications, receipts, and broadcast-style sends. gent.mx is for inboxes where replies become ongoing work.
- If a reply creates a task, follow-up, approval, contact update, file, or business record, the problem is no longer only delivery — it is operational email.
- For vendor and document-heavy intake, see the vendor and invoice intake guide.
- When inbound mail should become a task, webhook, file, or approval, see inbox-to-workflow automation.
- Several transactional tools now support inbound mail, webhooks, retention, or received-message APIs. gent.mx is different because contacts, approvals, sequences, and workflow state sit around the inbox record.
- If you're building a product that both sends and receives mail — support threads, client inboxes, agent conversations — gent.mx gives that loop a persistent operating record.
Related guides
When to use a transactional API instead
For high-volume one-way sending — receipts, password resets, alerts, notifications — transactional APIs are purpose-built, cheaper per message, and better optimised for deliverability at scale.
- You're sending millions of notification or transactional emails per month. Per-send pricing is far cheaper than per-inbox at that volume.
- Deliverability tooling matters most — dedicated IPs, warming schedules, bounce and complaint management. Postmark and Resend excel here.
- You need high-volume sending or simple inbound webhooks more than delegated inbox work. Transactional APIs are tuned for that.
- The two tools complement each other well: route broadcast sends through a transactional API, and use gent.mx for the inboxes that have real two-way conversations.