SMTP configuration: connection settings

This article presents all the settings needed to connect your application or software to the Cyberimpact SMTP Relay. After reading it, you will know which settings to enter in your tool for sends to work correctly.

What it's used for

This configuration allows your application to authenticate with Cyberimpact's server and send emails using Cyberimpact's sending infrastructure. This is the step that follows the creation of your SMTP credentials.

Before you begin

• Have created an SMTP user in your Cyberimpact account. If this hasn't been done yet, refer to the article How to retrieve your SMTP credentials
• Have your SMTP username and password on hand
• Have access to the outgoing connection settings of your application or software

Connection settings

Here is the information to enter in your application to establish the connection:

How it works

Available ports

Two options are available depending on what your application supports:

• Port 587 with STARTTLS: the connection is first established in plain text, then automatically switches to encrypted mode before authentication. This is the most common option.
• Port 465 with SMTPS: the connection is encrypted from the moment it opens. Some older software uses this port.

If your application asks which port to choose, go with 587.

Authentication methods

The Cyberimpact SMTP service supports the PLAIN and LOGIN authentication methods. Most applications use them automatically — no special configuration is needed on your end.

Step by step

1. Open the SMTP connection settings of your application (usually found in the email sending or notifications settings).
2. Enter the SMTP server address: smtp-relay.cyberimpact.com. To find your complete connection information, go to the Domains tab, click on your domain to open its page, then in the Users section, click icone to the right of the relevant user to open the action menu and select View details.
3. Choose the port: 587 for STARTTLS or 465 for SMTPS, depending on what your application offers.
    
   Port 587 requires your software to enable STARTTLS before authenticating. If your software attempts to authenticate without STARTTLS on this port, the connection will fail. Port 465 uses SSL/TLS from the moment the connection is established, no STARTTLS command is needed. If in doubt, try port 587 first. It is the most commonly supported by third-party software (WordPress, WooCommerce, etc.).
   
   What is STARTTLS? It is a command sent by your software to the server to enable connection encryption before transmitting your credentials. It is the equivalent of locking the door before exchanging confidential information. In most software, this option is called "STARTTLS", "TLS", or "Secure connection".
4. Enable TLS or SSL encryption according to your application's terminology.
5. Enter your SMTP username as displayed in your account.
6. Enter your SMTP password. If you no longer have it, you will need to reset it from the user's profile.
7. Save the configuration and send a test email to validate the connection.
8. Check the result in the Activity tab of your SMTP account.

Service limits

These limits apply to all accounts, regardless of plan:

See also:

• How to retrieve your SMTP credentials
• How to test an SMTP integration
• SMTP domains and their authentication
• How SMTP sending quotas work
• What file types can I send as an attachment?