imageRUNNER 1730i & 1133: Direct send from scanner to email stopped working

[manevskim]

I have two Canon printers (imageRUNNER1730i and imageRUNNER1133)that suddenly stopped sending emails connected to O365 using direct send.
Port 25 is open. The SMTP server is set correctly since nothing has been changed, and it is accessible. However, I keep getting error #806.
What could be the issue?

[Ron]

Welcome to The Canon Community, and thank you for your inquiry, manevskim!
We appreciate your participation, however, we need to let you know that the Canon Community is hosted and moderated within the United States by Canon USA. We are only able to provide support for Canon products manufactured for and used within the US market. The imageRUNNER 1730i isn't sold or supported by our team here at Canon USA.
If you live outside the United States, please CLICK HERE and select your country or region for your support needs.
You're welcome to discuss Canon products sold outside of the United States, but please be aware that you will not receive support directly from Canon USA.