How do verified sending domains, webhooks, and logs work in an email API?

In an email API, these three features usually cover trust, event tracking, and debugging:

1) Verified sending domains

A verified sending domain proves you’re allowed to send email from a domain like yourcompany.com.

Why it matters

• Improves deliverability
• Prevents spoofing/impersonation
• Lets receiving mail servers trust your messages more

How it works

You add DNS records to your domain, such as:

• SPF: says which servers can send mail for your domain
• DKIM: cryptographically signs outgoing email
• DMARC: tells receivers how to handle unauthenticated mail

Once the API provider detects those DNS records, it marks the domain as verified. Then you can send mail using addresses like:

• no-reply@yourcompany.com
• support@yourcompany.com

Common flow

1. Add your domain in the email API dashboard
2. API gives you DNS records to publish
3. You add them at your DNS host
4. Provider checks them
5. Domain becomes verified

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2) Webhooks

A webhook is a callback URL your app exposes so the email provider can notify you when something happens.

Typical email events

• accepted / queued
• sent
• delivered
• opened
• clicked
• bounced
• complained
• unsubscribed

How it works

1. You register a URL, e.g. https://api.yoursite.com/email-events
2. The email provider sends an HTTP request to that URL when events occur
3. Your app processes the event and updates your database or analytics

Why it matters

• Lets you track delivery and engagement in real time
• Helps build bounce handling and suppression lists
• Useful for support and analytics

Best practices

• Verify webhook signatures so the requests are authentic
• Make handlers idempotent, since providers may retry
• Respond quickly with 200 OK
• Store event IDs to avoid duplicates

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3) Logs

Logs are records of the emails your API sent and what happened to them.

What logs usually include

• Message ID
• Recipient
• Sender
• Subject
• Timestamp
• Delivery status
• Error details
• Event timeline

Why they matter

Logs help you:

• Debug failed sends
• Investigate bounces
• Confirm whether a message was accepted or delivered
• Trace issues with templates, API calls, or DNS setup

Typical usage

You send an email request and get back a message ID. Later, you can:

• Query logs by message ID
• See the delivery path
• Inspect errors like invalid recipient, blocked domain, or authentication failure

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How they fit together

A simple flow looks like this:

1. Verify your domain

   • So you’re allowed to send from your address

2. Send an email

   • API accepts the request and creates a message record

3. Provider tracks delivery

   • Email is queued, sent, delivered, bounced, etc.

4. Webhooks notify your app

   • Your server gets updates automatically

5. Logs provide history

   • You can inspect what happened later

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Example scenario

You send a receipt from billing@yourcompany.com.

• The domain is verified, so sending is allowed
• The API returns a message ID
• A webhook later says the email was delivered
• If the mailbox doesn’t exist, a webhook says bounced
• You check logs to see the exact error and recipient status

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If you want, I can also show:

• a sample API request/response
• a webhook payload example
• or a diagram of the full email flow