How to Connect Your WordPress Site to Cyberimpact's SMTP Relay

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This tutorial explains how to connect your WordPress site to Cyberimpact's SMTP relay so that your WordPress emails (notifications, order confirmations, password resets, etc.) are sent through Cyberimpact's reliable infrastructure.


Before You Begin

Why a plugin? By default, WordPress uses the PHP mail() function to send its emails — an unreliable method that often ends up in spam. An SMTP plugin allows WordPress to use a real sending server, such as Cyberimpact's SMTP relay.

This tutorial uses WP Mail SMTP as an example, as it is one of the most widely used plugins and its interface is well documented. Others exist (Fluent SMTP, Post SMTP, etc.) that work equally well with our relay. Cyberimpact does not guarantee the performance of these plugins and cannot offer support for their specific configuration.

Step by Step

1. Install WP Mail SMTP

  1. Log in to your WordPress dashboard.
  2. In the left menu, go to Plugins → Add New Plugin.
  3. Search for WP Mail SMTP.

    Settings
  4. Click Install Now, then Activate.


     

2. Configure WP Mail SMTP

  1. In the left menu, go to WP Mail SMTP → Settings.
  2. In the Sender section, configure:
    From Name: the name that will appear in the recipient's inbox (e.g., your company name)
    From Email: the email address you want to use for sending — it must belong to the domain authenticated in your SMTP account

    Settings
  3. In the Mailer section, select Other SMTP.
  4. Configure the following settings:
    Parameter Value
    SMTP Host smtp-relay.cyberimpact.com
    Encryption TLS
    Port 587
    Authentication Enabled
    SMTP Username Your username generated by Cyberimpact
    SMTP Password Your password generated by Cyberimpact
  5. Click Save Settings.


     

3. Test the Configuration

  1. In WP Mail SMTP, click the Tools tab.

    Tool tab
  2. Enter a test recipient email address.
  3. Click Send test email.
  4. Verify that the email is received in the inbox.
  5. Log in to your Cyberimpact account, go to the SMTP section, Activity tab — you should see the test email with a Delivered status.


Tips and Tricks

The test email lands in spam?
Check that your domain is properly authenticated in the Domains tab of your SMTP account — the DKIM 1, DKIM 2, and SPF/Return-Path (MX) records must all show a Valid status. Also check your DMARC record.
The sender address must match your authenticated domain
If you configure contact@mycompany.com as the sender address, the domain mycompany.com must be authenticated in your SMTP account. An SMTP user linked to a different domain will not be able to send from that address.


Using WooCommerce?
WooCommerce uses the same email sending system as WordPress. Once WP Mail SMTP is configured, all WooCommerce emails (order confirmations, shipping notices, etc.) will automatically go through Cyberimpact's SMTP relay — no additional configuration is needed.


Have multiple WordPress sites?
Create a separate SMTP user in your Cyberimpact account for each site. This allows you to track sends from each site separately in the Activity tab and revoke one site's access without affecting the others.


Port 587 not working?
Some hosting providers block port 587. In that case, try port 465 with SSL encryption. If both ports are blocked, contact your hosting provider.


WP Mail SMTP shows an SPF warning after the send test?
This is normal with our SMTP relay and can be ignored.
Here's why: the plugin checks whether our sending server is listed in the SPF record of your main domain (e.g., mycompany.com). But our relay doesn't work that way. When you send an email, we use a dedicated bounce-handling address on a subdomain you own — for example cyberimpact-bounces-abc123.mycompany.com — and that's where SPF is verified, not on your main domain. The plugin doesn't see this mechanism and incorrectly displays a warning.
To confirm that everything is truly working, look instead at the DMARC section on the same page — if it shows ✅ Success and your domain displays "Validated" in Cyberimpact, your emails are properly authenticated and there's nothing more to do.

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