Diagnosis
The "cannot connect to SMTP server" error on the Canon imageCLASS MF269dw II typically indicates a handshake failure between the printer's internal network card and the outgoing mail server. This happens because modern email providers (Google, Microsoft 365, Yahoo) have deprecated "Less Secure Apps" and basic authentication. The printer is attempting to send a plaintext password or a standard login request that the server rejects for security reasons, causing the connection to time out or be actively refused. To confirm this is an authentication or port issue rather than a hardware failure, check the printer's network status. If the printer can print from your PC but cannot scan to email, the physical connection is fine. The failure is specifically occurring at the SMTP layer, likely due to a mismatch in the Port number (25 vs 465 vs 587) or the lack of a dedicated App Password, which is now mandatory for Gmail and Outlook accounts using Two-Factor Authentication (2FA).
How to Fix It
To resolve this, you must move away from the small printer touchscreen and use the Remote UI (Web Interface) for precision.
- Find your printer's IP address by pressing [Status Monitor] > [Network Information] > [IPv4].
- Open a web browser on your computer and type that IP address into the address bar to open the Remote UI. Log in as Administrator.
- Navigate to [Settings/Registration] > [Network Settings] > [Email/SMTP Settings].
- Enter the SMTP Server Address: For Gmail, use
smtp.gmail.com; for Outlook/Hotmail, usesmtp-mail.outlook.com. - Set the Port Number to
587. This is the industry standard for STARTTLS encryption. - Set SMTP Authentication to [On].
- In the User Name field, enter your full email address (e.g., [email protected]).
- In the Password field, do NOT enter your regular login password. You must generate an App Password from your Google or Microsoft account security settings. This is a unique 16-character code specifically for the printer.
- Set TLS/SSL to [On] or [STARTTLS] if the option is visible.
- Click [OK] and restart the printer to commit the changes to the NVRAM.
If That Didn't Work
- DNS Configuration: The printer may be unable to resolve "smtp.gmail.com" into an IP address. Go to [Network Settings] > [TCP/IP Settings] > [IPv4 Settings]. Change the DNS server from "Auto" to "Manual" and set the Primary DNS to
8.8.8.8(Google DNS) and the Secondary to8.8.4.4. - Port 465 Alternative: Some network firewalls block port 587. Try changing the SMTP port to
465and ensuring that "SSL/TLS" is enabled. This uses a different encryption method (Implicit SSL) that may bypass certain router restrictions. - Email Address Mismatch: Ensure the "Sender Address" configured in the printer's General settings exactly matches the email account used for the SMTP authentication. If the "From" address is different from the authenticated account, many servers will reject the mail as a spoofing attempt.
- Firewall/Antivirus Blocking: Temporarily disable any third-party firewalls (like Norton or McAfee) on your network. Some security suites identify SMTP traffic from non-PC devices as a "spam bot" and block the outgoing port at the router level.
Heads Up
- Password Updates: If you change your main email password, your App Password remains valid, but if you revoke all trusted devices in your account settings, you will need to generate a new App Password for the printer.
- Firmware Updates: Ensure your MF269dw II is on the latest firmware. Canon frequently releases patches that improve compatibility with updated TLS encryption protocols required by Google and Microsoft.
- Avoid Port 25: Never use Port 25 for SMTP settings; almost all residential ISPs block this port to prevent spamming, and it provides no encryption for your password.
- Static IP: Assign a static IP address to your printer in the Remote UI. If the printer's IP changes via DHCP, it can occasionally disrupt the handshake with the mail server.