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SMTP Anonymous settings fail
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CFox_MerIT
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March 31, 2015 - 1:30 pm
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I am trying to get email to work on several DVR and NVR units at various clients.

I have configured my mail servers at each location for anonymous relay, and the relay works correctly with our copiers, scanners, and other servers.

When I choose Anonymous for the authentication inside the NVR and hit test, it comes back with “Test Failed!”

Using Wireshark, I can see that the NVR is sending <>> as the MAIL FROM: address. Obviously that mail server rejects that, since it’s not a valid from address. On the DVR, the Sender field is filled in, but it greys out when checking the Anonymous box. On the NVR, the field doesn’t grey out, but it is still sending a blank from address.

Is there a known issue with using anonymous email? Is there another location I need to add the FROM email address, so that the NVR actually sends it to the mail server? I cannot reconfigure the relay connectors to require authentication at each location, as it will interfere with other devices which use the same relay, so I need Anonymous to work correctly.

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javajeff
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March 31, 2015 - 1:59 pm
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Our DVRs support Gmail and Yahoo smtp, and we are unable to test any custom email smtp servers.  Have you tried using a user account instead of Anonymous?  Have you tried setting up your smtp servers to allow for <>> as the MAIL FROM: address since you know that is being rejected?  There are no known issues with Anonymous at this time.

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CFox_MerIT
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March 31, 2015 - 2:24 pm
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These DVRs are in a corporate environment, and so policy will not allow the messages to be sent using Gmail or Yahoo.
I have tried a user account, but the authentication type it is using is not accepted by any of the Exchange servers. Since they are already configured to use anonymous for all of the other devices that connect to them, reconfiguring the connectors is not an option.

There is no way to configure the SMTP server to accept <>>, since it is not a valid SMTP address.

You say that there are no known issues with Anonymous at this time, but sending an invalid FROM address is definitely an issue. Can we raise a bug ticket with the manufacturer and see if they can get us a firmware that resolves that issue?

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javajeff
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March 31, 2015 - 2:49 pm
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You can send your order number, model number, picture of the back of the unit, and a screenshot of the system info screen with the firmware and build date for us to check if there is an update.  Send to tech@techprosecurity.com

NOTE: we are checking with the engineering team regarding this issue.  Keep in mind that the DVRs and NVRs use a proprietary Linux OS, so postfix could be a compatible choice.

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javajeff
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April 2, 2015 - 9:29 am
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These NVRs and DVRs do not support exchange and do not support domains.  You can set up a free Google account just to send emails, and then use any recipient that you want.

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