I cannot connect to an SMTP server

Reviewed on May 05, 2026

Problem

I cannot connect to an SMTP server.

Cause

• The SMTP ports are disabled.
• Using wrong credentials (e.g., email address as username instead of the Project ID).

Solution

Enable SMTP ports on a Scaleway Instance

By default, the SMTP ports (587, 465, and 2465) are disabled on all Scaleway Instances. To enable them:

1. Click CPU & GPU Instances in the Compute section of the side menu. The Instances page displays.
2. Select the Availability Zone (AZ) from the drop-down menu (e.g., PAR1) to view resources in the selected AZ.
3. Click the Security groups tab. The Security groups dashboard displays.
4. Click the security group you want to edit.
5. Tick the Enable SMTP box to allow outgoing emails.

Enable SMTP ports on other environments

Verify your SMTP credentials

Make sure you use the correct credentials:

• Hostname : smtp.tem.scaleway.com
• Port : 587 (STARTTLS), 465 (SSL), or 2465 (TLS)
• Username : your Project ID
• Password : your API Token with Transactional Email permissions