Customer.io Deliverability Monitoring Tool

Keep sending with Customer.io. Tatami reads its delivery events and shows you what bounced, what got blocked, and what to fix next.

No DNS changes. No rerouting mail. See the Customer.io setup.

See what happens after Customer.io sends.

Customer.io

Sending as usual

Event webhook

https://tatamimonitor.com/webhooks/customer_io/a8f3b2c9
  • Mail still sends from Customer.io
  • Nothing to change in DNS
Customer.io events Live
Dropped icloud.com now
Delivered yahoo.com now
Bounced outlook.com now
Delivered gmail.com now
Tatami Last hour
Delivered
48,210 · 97.8%
Deferred
702 · 1.4%
Bounced
394 · 0.8%

Outlook deferrals up 4x

451 4.7.650 · 198.51.100.24

Your mail keeps flowing through Customer.io. Tatami only reads the events it reports.

Trace every Customer.io problem to its cause.

A lifecycle journey can be configured correctly while individual emails still bounce, fail, or get dropped. Tatami connects to Customer.io Reporting Webhooks to bring those delivery outcomes into one monitoring view. Keep campaign, broadcast, action, and delivery identifiers available when investigating which message in a customer journey needs attention.

Fix problems before customers notice.

Tatami explains each bounce, watches your IPs and domains, and tells your team when something breaks.

Bounced outlook.com 1,240 since 9:00

550 5.7.1 Messages from [198.51.100.24] weren't sent. Part of their network is on our block list (S3150).

Microsoft is blocking 198.51.100.24.

  1. 1Move Outlook traffic off that IP.
  2. 2Request delisting at sender.office.com.
Why are Outlook bounces up today?

1,240 Outlook bounces since 9:00, all from 198.51.100.24.

Microsoft is blocking that IP. Gmail and Yahoo look normal.

Microsoft block Gmail healthy Yahoo healthy
Ask about your Customer.io traffic

Also works in Claude Code and Codex through mcp.tatamimonitor.com.

Asset Status 7 day trend
198.51.100.24 Microsoft block
mail.acme.io Clean
203.0.113.8 Barracuda
Checked 12s ago 100+ lists

Google, Yahoo, and Microsoft signals for every IP and domain.

Tatami APP 9:14 AM

Outlook is bouncing mail from 198.51.100.24 with 550 5.7.1 S3150.

View in Tatami Mute 1h

Also sent to Discord Email

Rules on bounces, blocklists, volume, and throttling.

Connect Customer.io in a few minutes.

Point the Customer.io webhook at Tatami. Your mail keeps sending the same way.

  1. 1

    Create a Customer.io source in Tatami and copy its webhook URL. Name the source for the Customer.io workspace whose lifecycle email you want to monitor.

  2. 2

    In Customer.io Integrations, add a Reporting Webhook using the Tatami URL. Select email delivered, bounced, dropped, failed, spammed, and unsubscribed events, then save and enable the webhook.

  3. 3

    Use Customer.io's Send Test action, then send an email through a journey. Confirm the delivery outcome and campaign or action identifiers appear in Tatami.

Turn on these Customer.io events.

Endpoint URL

https://tatamimonitor.com/webhooks/customer_io/a8f3b2c9
  • Delivered
  • Bounced
  • Dropped
  • Failed
  • Spammed
  • Unsubscribed
Test event received just now

Detail depends on the fields your webhook sends. Opens and clicks are not needed.

Questions about monitoring Customer.io.

Should I use a Customer.io Reporting Webhook or a journey webhook action?

Use Reporting Webhooks for this connection. They report message outcomes such as delivery, bounce, drop, failure, and spam complaints. A webhook action inside a journey serves a different purpose and does not automatically supply the reporting event feed.

Do I need to enable Body Content in Customer.io?

No. Tatami's delivery monitoring does not require email body content. Leave that option off for this setup. Tatami uses the reporting event's delivery identifiers, campaign context, and failure details, and skips sent, opened, and clicked events.

Does a delivered Customer.io email mean it reached the inbox?

No. A delivery event means the receiving mail server accepted the message. It does not confirm whether it reached the inbox or spam folder. Tatami monitors the delivery events you send, bounce reasons, and sender reputation to help you investigate deliverability issues; it does not measure inbox placement.

Providers are unlimited on every plan. Connect the rest of your email stack the same way.

$10 per million emails. First 100 IPs free. See pricing

Start monitoring your Customer.io email.

Connect the webhook and watch your first Customer.io events arrive in minutes.