The problem to solve
A successful application handoff does not always prove that the provider accepted or delivered the email. Diagnose every layer in order.
Troubleshooting guide
WordPress admin email works but customer email does not
Check notification settings, recipients, message type and authenticated delivery when only customer-facing WordPress email fails.
WordPress admin email works but customer email does notapikey + apikeyboxNotification configuration → delivery result
A practical implementation path
Reproduce the failure with a unique test, inspect the MailBridgeAPI or provider response, confirm mailbox health and only then test recipient delivery.
01 — 03
From mailbox to working request
Connect the mailbox
Authorize the mailbox or configure its compatible SMTP and IMAP connection in the MailBridgeAPI dashboard.
Keep keys in the backend
Store the account API key and mailbox API key in server-side environment variables or a secret manager.
Call and verify the endpoint
Run the request, inspect the JSON response and keep the request or message identifier for support.
Notification configuration → delivery result
Copy-ready example
Check notification settings, recipients, message type and authenticated delivery when only customer-facing WordPress email fails.
- One mailbox connection managed centrally
- API access without copying the mailbox password into every project
- Dashboard activity, errors and mailbox health
- A testable path from code to the real mailbox
<?php
add_action('init', function () {
if (!current_user_can('manage_options') || !isset($_GET['mb_customer_test'])) return;
$sent = wp_mail('customer@example.com', 'Customer path test', 'Testing the customer-facing path.');
wp_die($sent ? 'WordPress accepted the message.' : 'WordPress rejected the message.');
});Provider and implementation limits
The plugin handles software that uses wp_mail(). A plugin that bypasses wp_mail() needs its own integration. Provider and DNS configuration still affect delivery.
LIVE SMTP · IMAP · OAUTH DEMO
Test the real connection before you build
The live demo can validate SMTP, IMAP or a supported OAuth provider and issue temporary API keys without creating an account.