DNS Error sending email

[Santander]

Same on both machines.Also tried google DNS and Open DNS.

Office365 will create problems with older machines using scan to email for various reasons and sometimes upgrading the firmware will resolve the issue. Since you state that you are receiving a DNS error it could be that the customer's domain name is not properly registered with MS Office 365. You do not mention if the customer has a DNS server on their network or if they are using an outside server? MS has several tech bulletins describing problems with improper configuration of the DNS settings for Office 365 that inhibit the proper flow of sending emails. One of these states that if the customer's domain name is not properly registered in the MS name servers it will inhibit proper email flow. Try changing the DNS settings in the unit to point to the MS DNS server. MS does have a diagnostic tool for Office 365 DNS problems available on their website. Hope this helps.

[dickierock]

Use the customer's MX record as the SMTP server on port 25 with no authentication. Put their domain into the following link:

MX Lookup Tool - Check your DNS MX Records online - MxToolbox

Hi,
Just curious, is this method secure if unauthenticated?
I gather this enables to send email within the organisation but not
to external recipients.
Thanks.

[Kimi]

Hi,
Just curious, is this method secure if unauthenticated?
I gather this enables to send email within the organisation but not
to external recipients.
Thanks.

Correct, see How to set up a multifunction device or application to send email using Office 365 | Microsoft Docs

[richs]

Both Machines are setup to use Gmail now not Office 365 and I do know what the proper settings are for both Gmail and Office 365.They do have have their own DNS server and I have tried other DNS servers.The OKI MPS 5502 works ok .The OKI ES8473 does not.They run on different software and are not old machines(MPPS5502 is a current model and thou the ES8473 is not sold here any more for marketing reasons it is a current model sold in Europe)I have told the customer to try the IP address of the gmail server or even better go back to using Office 365 but setup a relay.

[tonerhead]

365 is always sort of troublesome. Not really very knowledgeable on those oki models, however, is there a checkbox to turn off ssl? Seems if this is on sometimes 365 won't work. 365 needs startls. Why a dns error though.....are they using a proxy server for outside access?