SendGrid Inbound Parse vs agentinbox.pro

SendGrid Inbound Parse and agentinbox.pro both turn inbound email into HTTP callbacks. This page is for developers evaluating inbound parse alternatives.

At a glance

	SendGrid Inbound Parse	agentinbox.pro
Primary model	Parse hook on a subdomain	Domain-bound catch-all + JSON webhook
Outbound SMTP	Yes (SendGrid sending)	No — receive-only
Setup	MX + parse URL per subdomain	MX + TXT verify + webhook URL
Payload	Multipart form (raw + parsed fields)	Normalized JSON + HMAC signature
Instant try	Requires SendGrid account + DNS	Instant inbox on platform subdomain

When SendGrid fits

• You already send mail via SendGrid and want parse on the same vendor
• You need outbound + inbound in one provider
• You prefer multipart form posts over JSON

When agentinbox.pro fits

• You want receive-only — narrower attack surface, no send path
• You need catch-all on your apex domain without per-address API setup
• You want signed JSON webhooks with stable event_id, replay API, and raw .eml retention
• You’re building agent workflows (OpenClaw, custom webhooks) not human inboxes

Migration sketch

SendGrid parse URL          →  PATCH /api/domains/:id/delivery { webhookUrl }
SendGrid parsed fields      →  inbound.email.received JSON (from, recipient, subject, text)
SendGrid raw MIME attachment → rawRef + stored .eml in R2

Next steps

• Quickstart — BYOD domain path
• Webhook events — payload and signature verification
• Resend inbound comparison