Troubleshooting email delivery issues

Reviewed on August 11, 2025

Problem

You are experiencing issues with sending or receiving emails using your Web Hosting.

Symptoms

• Emails are not being received or sent.
• Emails are landing in the spam folder instead of the inbox.
• Your mail server rejects outgoing emails.
• You receive bounce-back messages with error codes.

Possible causes & solutions

Incorrect IMAP/POP3 configuration

Cause

Your email client or application may have incorrect IMAP/POP3 settings, preventing emails from being received.

Solution

• Check your SMTP server address, port, and authentication method in your email client.
• Use the correct SMTP settings provided for your mailbox:
  • Incoming mail Server: yourdomain.com (or as provided by the instructions in your hosting panel)
  • Port: 993 (IMAP, recommended) or 995 (POP3)
  • Authentication: Enabled (use your email credentials)
• Ensure your firewall or ISP is not blocking any of these ports.

Incorrect SMTP configuration

Cause

Your email client or application may have incorrect SMTP settings, preventing emails from being sent.

Solution

• Check your SMTP server address, port, and authentication method in your email client.
• Use the correct SMTP settings provided for your mailbox:
  • SMTP Server: yourdomain.com (or as provided by the instructions in your hosting panel)
  • Port: 465 (SSL)
  • Authentication: Enabled (use your email credentials)
• Ensure your firewall or ISP is not blocking outgoing SMTP connections.

Missing or incorrect SPF, DKIM, and DMARC records

Cause:

• If your domain lacks proper DNS records for email authentication, recipient mail servers may flag your emails as spam or reject them.

Solution

Update your DNS zone with the recommended settings for your Web Hosting plan from the *DNS verification tab in the Scaleway console.

IP address blacklisted for spam activity

Cause

If your server's IP address has been flagged for sending spam, email providers may reject your messages.

Solution

• Check if your IP is blacklisted using MXToolbox Blacklist Checker.
• Scan your devices (desktop computers, laptops, mobile phones, etc.) for malware or compromised email accounts.
• If blacklisted, contact our technical support for further assistance.
• Optional: Order a dedicated IP address in the Scaleway console, reserved for emails sent and received by domain names linked to your Web Hosting.