Inboxwire by BufferSol vs EmailEngine
Both give your app one REST API and webhooks over Gmail, Microsoft 365 and IMAP. EmailEngine is mature and self-hosted only. Inboxwire by BufferSol is not affiliated with Postal Systems OU. Prices read 3 Nov 2026.
Start free| Feature | EmailEngine | Inboxwire |
|---|---|---|
| Price | $1,450 a year, annual only | $708 a year self-host, or Cloud from $24.99 a month |
| Hosted option | No | Yes |
| Self-hosted | Yes | Yes |
| Free tier | 14 day trial | 3 mailboxes, forever |
| Monthly billing | No | Yes |
| Webhook delivery log with replay | Last 500 failures for 7 days | Full log, one-click replay |
| Horizontal scaling | Single instance | Planned for v1 |
| CASA Readiness Kit | No | Free on every plan |
| Source | Source-available, commercial | Commercial |
Where EmailEngine is the better choice: it has been in production since 2020, it is built by the author of Nodemailer, and it ships a release every few days. If you want the most battle-tested self-hosted option and price is not the deciding factor, it is a safe pick.
Common questions
Is Inboxwire by BufferSol affiliated with EmailEngine?
Inboxwire by BufferSol is not affiliated with Postal Systems OU.
Does self-hosting remove the Google CASA requirement?
No, with either product. CASA applies to your own OAuth app.
Is Inboxwire by BufferSol half the price?
$708 a year against $1,450 a year for the self-hosted licence. Prices read 3 Nov 2026.
Try Inboxwire on three mailboxes
Connect a mailbox and watch the first signed webhook arrive.
No credit card needed.