MXora Email Send Check is the official connector for EmailSendCheck.com, automatic email monitoring for agencies and freelancers who look after WordPress sites.

A WordPress site can look perfectly healthy while its email has quietly stopped working. The contact form still says “Thank you”, but enquiries aren’t arriving, and customers aren’t getting their order or booking confirmations.

Email Send Check catches this before your clients notice. On your chosen schedule, it asks this plugin to send a short test email with WordPress’s own wp_mail(). The email goes through whatever the site already uses, whether that’s the server’s own mail or an SMTP plugin such as WP Mail SMTP, FluentSMTP or Post SMTP, so it takes the same route as the site’s real emails.

Each test email is checked for:

Delivery: whether it arrived, or the error WordPress gave if it couldn’t send.
Sending speed: how long WordPress took to send it. A slow mail server makes every contact form, checkout and password reset wait.
Delivery time: how long it took to arrive.
Spam placement: whether spam filters marked it as spam.
SPF, DKIM and DMARC: whether the domain’s email authentication passes.

You monitor all your sites from one dashboard, with an alert when a test fails, explaining the problem and how to fix it.

This plugin needs an EmailSendCheck.com account. The Free plan monitors one site at no cost, and the Freelancer and Agency plans monitor more sites, more often. See pricing.

Safe to install on client sites

The plugin only responds to requests signed by EmailSendCheck.com. Every request is verified with an Ed25519 signature, is timestamped and can only be used once. The plugin holds only the service’s public key.
It adds one REST API endpoint, /wp-json/mxora-email-send-check/v1/webhook. Anything unsigned or altered is rejected.
A site connects to one account, the first time it’s verified, within 4 hours of activation. Requests from other accounts are rejected afterwards. When the site is removed from that account, the plugin disconnects.
Test emails can only go to the service’s own test inboxes, set in the plugin’s code, with a fixed message. The plugin can’t be used to send email to any other address.
It can’t change the site’s settings or access its content.
Tests are rate limited on the site itself, to at most 10 test emails in any 60 minutes.
The plugin makes no outbound requests apart from the test emails, and loads nothing on the site’s pages.
You never give EmailSendCheck.com mail passwords, API keys or a WordPress login.

External services

This plugin connects the site to EmailSendCheck.com (https://emailsendcheck.com), an email monitoring service run by Ascend Online Media Limited. It’s needed so the service can test that the site’s email is working.

The plugin never makes HTTP requests to the service. It only replies to signed requests the service sends: when the site is first connected, each time a test runs (on the schedule chosen in the EmailSendCheck.com account, or when a test is run manually), and when the site is removed from the account.

Every reply includes the plugin’s version number. Replies to test requests also include whether the email was accepted for sending, how long sending took and when, the type of mail transport in use (for example PHP mail or SMTP), which known email plugins are active, the name of any plugin that replaces WordPress’s mailer, and any error message. No credentials are sent. Any email address in an error message is masked (for example, [email protected] is sent as j*@example.com), but error messages may include the name of the mail server the site tried to reach.

Each test email is sent to the service’s test inboxes. It contains the site’s name and URL, a test ID and the time it was sent, and its headers include the test ID and the site’s ID with the service.