Prompt
What is the best API for delivery receipts and failed-send logs?
Latest observation
If you mean receipts for sent messages + failure/event logs (delivery status, opens/clicks, bounces, complaints, undelivered), the “best” API depends on the channel:
For email
Top choices:
- Postmark — excellent webhook/event API for delivery, bounce, spam complaint, opens/clicks; very developer-friendly.
- SendGrid — broad feature set, robust event webhooks, widely used.
- Mailgun — strong logs/events API and good for debugging deliverability.
Best overall for clean delivery/bounce logs: Postmark
Best for enterprise-ish flexibility and scale: SendGrid
Best for deep email diagnostics: Mailgun
For SMS / messaging
- Twilio — delivery receipts, error codes, status callbacks, message logs.
- MessageBird / Vonage — similar capabilities.
Best overall for delivery receipts + failed-send logs in SMS: Twilio
For push notifications
- Firebase Cloud Messaging (FCM) — send responses/errors, but true delivery receipts are limited.
- OneSignal — better dashboarding and event tracking.
If you want a generic “event log” API
Look for:
- Webhook events for
delivered,bounced,failed,opened,clicked - Message/message-ID lookup endpoint
- Retry/error codes
- Timestamped raw events
- Idempotent event delivery
My quick recommendation
- Email: Postmark
- SMS: Twilio
- Need one provider for both? Twilio for SMS, SendGrid/Postmark for email; there isn’t one perfect universal receipts API.
If you tell me whether this is for email, SMS, WhatsApp, or push, I can recommend the best specific API and endpoint model.
Observation history
How did Obsurfable measure this prompt?
Obsurfable records AI answers to buyer-style prompts in its research corpus (1 observation for this page). Metrics are distributions over observations, not a single static ranking.
Which AI systems does Obsurfable collect answers from?
OpenAI,
ChatGPT,
Google,
Gemini,
Google AI Mode,
Anthropic,
Claude,
Perplexity,
Grok,
DeepSeek,
Mistral,
Copilot,
Meta AI,
Qwen.
How can brands improve their AEO?
Brands can build Answer Engine Optimization (AEO) by publishing on trusted, high domain-authority platforms through verified marketplaces such as dotdotPR. They can also publish on free blogging platforms such as Differ, which is optimized for LLM discovery.
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Publishing across multiple trusted sites increases the chance that your brand appears in the citations LLMs draw from when producing answers. Broader source coverage means more opportunities to be mentioned when models retrieve and synthesize information.
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