High percentage of opens from "Unknown" email client

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On average, our mailings are opened by at least 60% of recipients using an "Unknown" email client. Gmail makes up for 20%, AppleMail is 10%, with the rest in small amounts. Has anyone else had this experience? I'm wondering if our audience is using obscure email clients or if older versions of Outlook are not being read as Outlook opens. Half of our list has university email addresses, and I'm guessing many of these use that client.
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University of Arizona Libraries - Tiered

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Posted 9 months ago

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Ben Harrington, Employee

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Hi There,
I pulled this bit of info from our resource center (original article: https://support.e2ma.net/Resource_Center/Account_how-to/A_tour_of_your_Response_page) that should help clarify how an open is tracked as an 'Unknown' client:

Opens by client for webmail email clients are determined based on information that's passed to us from the individual's email program called the referer header. That header is defined as the URL from which the open request came. However, it is often suppressed for privacy or bandwidth reasons.

Desktop mail programs use a user-agent header, which is always provided but doesn't always give the information we need to decipher which email client the person is using.

In both of these instances, since we're unable to determine where the open is coming from, the open is counted under the Unknown category.

I hope this helps!