What is utm_source=newsletter?

Who adds it

A person or email tool set it on links in a newsletter. Google's URL builder docs use newsletter-style values (newsletter1, newsletter4) as examples of utm_source.

What it means

Someone clicked a link in an email newsletter. Who sent it isn't in the value itself; the utm_campaign or the page linked usually narrows it down.

What to do with it

GA4 only counts it as Email if the medium is email (or the source itself is email), so pair it with utm_medium=email. A newsletter value as the medium matches none of GA4's channel rules.

How Vireo shows it

Vireo Pro's UTM campaigns card lists tagged visits by Source, Medium and Campaign, with visitors and pageviews. The tags are read from the first page of each visit, and the same tags feed revenue by source.

In the free plugin, Vireo drops the query string from page addresses, keeping only a few WordPress ones such as p and page_id, so a tagged URL counts as the same page as the untagged one. The visit is counted under the referrer it arrived with.

When a link carries utm_source with no utm_medium, as ChatGPT's do, Pro's revenue attribution takes the medium from the referrer's source group. With no referrer either, it's labelled campaign.

UTM campaigns are part of Vireo Pro. See UTM campaigns in the docs.

Sources

http://www.example.com/?utm_source=newsletter1&utm_medium=email&utm_campaign=summer-sale

URL builders: Collect campaign data with custom URLs - Analytics Help

Email Source = email|e-mail|e_mail|e mail OR Medium = email|e-mail|e_mail|e mail

Default channel group - Analytics Help