Issue: Emails sent from a device that has Mailtrack are showing as having been "sent from device without Mailtrack"...
Explanation: This is likely being caused by how Mailtrack is integrating with your browser.
Please do as follows:
1) Open a new browser tab and go to gmail.com
2) Log into a Gmail account that you are not currently using with Mailtrack.
3) Enable Mailtrack on that Gmail account.
Once the Gmail tabs in your browser have finished refreshing then when you send an email from the Gmail account that you normally use with Mailtrack the tracking should start to work. If that is not the case, then please try this:
1) In a new tab in Chrome, copy/paste chrome://settings/siteData then press enter.
2) Search for mailtrack.io using the search option provided (as shown in the image below), then click on the trash can to delete the cookies for Mailtrack.
3) Refresh the tab containing Gmail 1-2 times then send an email to test whether the tracking works.
If, after trying this, it is still saying that your emails are being "sent from device without Mailtrack" then you may need to follow the steps mentioned here.