topic Re: imageCLASS MF733Cdw & imageCLASS MF743Cdw: Fax to Scan Function Stopped Working. in Office Printers

imageCLASS MF733Cdw & imageCLASS MF743Cdw: Fax to Scan Function Stopped Working.

dexman335 — Fri, 14 Mar 2025 15:14:32 GMT

Now this is a twist. I'm posting a question. 😁

I recently discovered that my MF743 and my church's MF733 are BOTH no longer able to scan to email. What happens is that after the recipient's Email address has been entered, the document scanned and the proper start button pressed (color or B&W), both machines will scan documents as expected. Each machine then starts the transmission process, but maybe 10 or so seconds later, the confirmation sheet spits out with the word "Error" on the left side of the confirmation page.

Now for the details:

Both locations (home & church) are using Verizon Fios.

Both machines use different Outlook addresses to send emails.

Both machine's options were not changed in any way, shape or form.

I defaulted the 743 and reprogrammed to see if that would resolve the issue. (It didn't).

Settings:

Port Number Settings:

LPD (515)

RAW (9100)

WSD Multicast Discovery (3702)

HTTP (80)

Multicast Discovery (427)

POP3 (110)

SMTP (587)

FTP (161)

SNMP (1500)

SMTP Server Address (smtp-mail.outlook.com)

Allow TLS (SMTP) On

SMTP Authentication (On)

Both email address passwords are verified to be correct.

Side note: I tried changing the email address in the church's 733 to a gmail and changed to SMTP to reflect Google's information. A retest still failed.

Thoughts? 🤔

Re: imageCLASS MF733Cdw & imageCLASS MF743Cdw: Fax to Scan Function Stopped Working.

shadowsports — Fri, 14 Mar 2025 16:13:18 GMT

Greetings,

I haven't sent for a bit. ISP is Comcast. Let me check my Scan to Email. I am using Gmail for SMTP.

Working like a charm. 🙂

Both M365 and Gmail require an App Password. These printers do not support Modern Authentication.

Re: imageCLASS MF733Cdw & imageCLASS MF743Cdw: Fax to Scan Function Stopped Working.

dexman335 — Fri, 14 Mar 2025 17:16:03 GMT

Hi Rick!

I would like to confirm that I had the 733 configured properly when trying to email using a Google address.

Could the port configuration for Google be posted?

I want to cover all of my bases before bringing Verizon into the picture. 🙂

Re: imageCLASS MF733Cdw & imageCLASS MF743Cdw: Fax to Scan Function Stopped Working.

shadowsports — Fri, 14 Mar 2025 19:14:49 GMT

I'm using port 587.

Re: imageCLASS MF733Cdw & imageCLASS MF743Cdw: Fax to Scan Function Stopped Working.

dexman335 — Fri, 14 Mar 2025 19:30:04 GMT

Hi again,

I'm also set to 587. I'm wondering about the SMTP Server Address.

Outlook's is: smtp-mail.outlook.com 🤔

Re: imageCLASS MF733Cdw & imageCLASS MF743Cdw: Fax to Scan Function Stopped Working.

shadowsports — Fri, 14 Mar 2025 20:08:59 GMT

Server address: smtp.gmail.com

Port: 465 for SSL or 587 for TLS

Authentication: Yes

Username: Your full Gmail address, including @gmail.com

Password: 16 digit App Password, omit the dashes

Re: imageCLASS MF733Cdw & imageCLASS MF743Cdw: Fax to Scan Function Stopped Working.

dexman335 — Sun, 16 Mar 2025 22:55:16 GMT

Thank you, Rick! I will try changing over to Google on my 743 to see if that makes any difference and then report back.

Re: imageCLASS MF733Cdw & imageCLASS MF743Cdw: Fax to Scan Function Stopped Working.

dexman335 — Tue, 25 Mar 2025 13:57:06 GMT

Haven't had the chance to test using Google. Will test as soon as possible. 🙂

Re: imageCLASS MF733Cdw & imageCLASS MF743Cdw: Fax to Scan Function Stopped Working.

dexman335 — Wed, 02 Apr 2025 15:39:43 GMT

I tried again...switching from Verizon Fios over to Google. Same result.
Ny next step is to start going "vendor by vendor" to make sure that everything is squared away. Common points are:

. Canon (albeit two different model AIOs).
. Microsoft (Using @outlook.com to send files).
. Verizon Fios (Service provider for both locations although the router at each location is different. The ONTs are the same).
🤔

Re: imageCLASS MF733Cdw & imageCLASS MF743Cdw: Fax to Scan Function Stopped Working.

jimstansel — Sun, 23 Nov 2025 03:09:46 GMT

I am having the same problem, also on Verizon Fios. It worked just fine and then all of a sudden it didn't. Did you find a solution?

Re: imageCLASS MF733Cdw & imageCLASS MF743Cdw: Fax to Scan Function Stopped Working.

dexman335 — Mon, 24 Nov 2025 00:25:28 GMT

Unfortunately, I gave up trying to troubleshoot the problem. I use Verizon Fios with two different Outlook email addresses. So there are three players involved:

. Canon

. Verizon

. Microsoft

I even tried using a google email address and still no luck. If worse comes to worse, I can scan to a USB drive, load the files to a computer and then either email them or load them to the cloud and do a file share.

I might revisit the problem soon, but my schedule is a bit busy at the moment.

Re: imageCLASS MF733Cdw & imageCLASS MF743Cdw: Fax to Scan Function Stopped Working.

shadowsports — Mon, 24 Nov 2025 15:26:10 GMT

I have Comcast and I'm using Gmail with an app password. It's working fine. You may have to give up using Microsoft 365 since Canon printers do not currently support modern authentication or oauth 2.0. I think Microsoft implemented this in July of this year. At some point, I hope that Canon will be able to release a firmware update to adds Modern Authentication oauth2.0 to its MF series printers.

I don't have any experience with Verizon FiOS. Most ISPs block Port 25 but I would think you could use 465, 587 or 993 without a problem depending on the mail host.

Re: imageCLASS MF733Cdw & imageCLASS MF743Cdw: Fax to Scan Function Stopped Working.

dexman335 — Mon, 24 Nov 2025 15:33:34 GMT

Hi Rick!

I remember trying to use my Gmail email, but that didn't work either. It just seems weird that the imageCLASS all in ones on Verizon Fios lost the ability to scan to email. 🤔

Re: imageCLASS MF733Cdw & imageCLASS MF743Cdw: Fax to Scan Function Stopped Working.

dexman335 — Mon, 24 Nov 2025 19:46:08 GMT

Hi Rick!

I closed the wrong browser and knocked myself out of the chat room. 😞
Thank you for sticking around to help direct us to resolving this problem once & for all. 🙂

Paul