When a visitor reaches your site from another website, the browser normally includes the domain of the referring website. This is how Independent Analytics (and every other analytics app) is able to report on where your traffic came from.
Traffic from emails is harder to track because most inboxes, like Outlook and Apple Mail, will hide the referrer info from the browser. This is done primarily for security purposes, and it means that Independent Analytics is not able to report accurately on how many visitors reached your site via email. These visitors are included in the Direct referrer instead.
However, there is a way to win back most of this data with the Campaigns feature in Independent Analytics Pro.
When sending an email to your list, you can include campaign parameters in each URL linking to your website. When a visitor clicks on one of these links, IA Pro will be able to record their visit in the Campaigns report. Using the UTM parameters, you can then see exactly how many visitors you’ve gotten from each individual email you’ve sent.

These visitors will still be reported as coming from the Direct referrer in the Referrers report, but this way, you’ll be able to get accurate visitor counts for your email broadcasts in the Campaigns report.
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