topic Re: imageCLASS MF753Cdw - Cannot Scan to Email with SMTP Auth - Error 806 (Could not find the server in Printer Software & Networking

imageCLASS MF753Cdw - Cannot Scan to Email with SMTP Auth - Error 806 (Could not find the server)

Rubberboot — Tue, 29 Apr 2025 17:38:24 GMT

We just purchased Canon MF753cdw for our 5-person office.

Here are the printer settings:

SMTP Server: smtp.gmail.com

E-Mail Address: eMail@gmail.com

SMTP Authentication (SMTP AUTH): On

User Name: eMail@gmail.com
Password: Gmail App Password (Without spaces)

Use TLS for SMTP TX: On

Networking

SMTP TX: 587

When I click on [Check SMTP Connection] button
Here is the result:

Could not find the server. Check the following:
- The settings for [SMTP Server]
- [DNS Settings] from the [IPv4 Settings] screen or the [IPv6 Settings] screen
If there are no problems with the settings on the device side, contact the SMTP server administrator.

I have tried SMTP Server: 173.194.203.26 (Which is smtp.gmail.com no DNS required)

Same error message as above.

I have spent serval days trying to trouble shoot this error.

Any help would be appreciated.

Re: imageCLASS MF753Cdw - Cannot Scan to Email with SMTP Auth - Error 806 (Could not find the server

Rubberboot — Fri, 02 May 2025 13:07:10 GMT

Solved

After 4 days of trouble shooting and reviewing multiple Canon, Google posts and ChatGPT trouble shooting here is the solution that worked. (Almost gave up and returned the printer)

From the Remote UI.

Data Management-->Initialize Menu-->Network Settings. Then click on the [Initialize] button top right corner.

Now [Restart Device] top left.

I then went to Network Settings-->Port Number Settings and reset SMTP TX:587 (Again)

Now [Restart Device] top left.

Reran the [Check SMTP Connection] and presto.

“Connection to the server was successful.”

I hope this helps someone else.

Re: imageCLASS MF753Cdw - Cannot Scan to Email with SMTP Auth - Error 806 (Could not find the server

shadowsports — Fri, 02 May 2025 15:36:17 GMT

Greetings,

Glad you figured it out. I use the same on my 2 lasers however, mine worked on the first attempt (both devices).

You must have inadvertently mistyped something somewhere requiring the network reinitialization. The UI does prompt for restart when you change port settings, etc.

Enjoy the printer. It's a good one.

Re: imageCLASS MF753Cdw - Cannot Scan to Email with SMTP Auth - Error 806 (Could not find the server

rmbs22 — Sat, 03 May 2025 23:23:08 GMT

I am really struggling with these steps on my end. i am restarting the device in the sequence noted. I confirmed port 587 for SMTP TX. Yet I continue to get the following error, even though I’ve checked both my G mail password credentials and my wife’s and they are accurate— same error for both emails. Help!

SMTP authentication (SMTP AUTH) error.
Check [User Name] and [Password] for SMTP authentication (SMTP AUTH).

Re: imageCLASS MF753Cdw - Cannot Scan to Email with SMTP Auth - Error 806 (Could not find the server

Rubberboot — Sun, 04 May 2025 13:05:26 GMT

Are you logging in with your Gmail (regular) password or Gmail app password? Here is a video on how to create an Gmail application password. https://www.youtube.com/watch?v=hXiPshHn9Pw

You need to use a Gmail application password on your printer to sign in.

Once the app password created, copy and paste it somewhere safe. It is 16 a digit password - 19 digits with spaces). I left the spaces in mine and it works/logs in fine.

Also in the "E-Mail/I-Fax Settings"

Make sure "Use TLS for SMTP TX " is enabled.

Hope this helps.

Re: imageCLASS MF753Cdw - Cannot Scan to Email with SMTP Auth - Error 806 (Could not find the server

FrankOM — Mon, 01 Dec 2025 00:31:59 GMT

Thank you. I was using ChatGPT trying to find a fix for about 2 hours. When I fed it your response we solved it within about 30 minutes more. Saved me time. Your sacrifice has not been in vein!!