How should email marketers adapt to proxy changes?

Marketers should shift focus from open rates to Click-Through Rates (CTR) for engagement tracking, as clicks provide accurate device and location data. Additionally, relying on explicit data collected at sign-up is more reliable than IP-based geolocation for opens.

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Impact of Email Proxies on Geolocation & Tracking

Q: Do email proxies affect geolocation by opens/views?

Yes, they do. Google, Apple & Yahoo hide the real User agent and IP address, so geolocation reports based on views/opens will not be 100% accurate, though they still provide a good indication.

Q: Do email proxies affect all Gmail users?

No, it only affects users opening their email using the web interface and the mobile Gmail app. Desktop clients like Outlook are not affected.

Q: How email proxies affect email clicks?

Clicks by subscribers still show the real IP address and user agent. Therefore, geolocation reports based on clicks remain accurate. But they do cause clicks inflation because they tend to follow all hyperlinks in a newsletter for security and spam detection purposes.

Q: Do proxies affect the IP address captured at opt-in?

No. When a user signs up through a form, the connection is direct. The captured IP address is real, allowing for accurate geolocation segmentation based on the sign-up source.

Learn how Gmail, Yahoo, Apple, and other mailbox providers' protection policies affect opens and clicks reporting in email campaigns by masking user data.

What is a User agent?

A user agent in the context of email refers to information about the operating system, browser, and device that recipients use to open their emails.

What is an Email client?

An email client is a software application, program or app that allows users to send, receive, and manage email messages. Examples include Microsoft Outlook, Gmail, Thunderbird, and Apple Mail.

How is an email open captured?

An email open is captured with the inclusion of an invisible image (tracking pixel) in the email that works as a tracker. Therefore, first of all the recipient must allow image downloading when reading the email.

How email proxies affect email opens?

A proxy agent may trigger an open even before the recipient actually opens an email and even if the recipient never opens the email.

This results to inflated, unreliable open rates. But there is more,

Although the open is recorded, Google, Apple, Yahoo, and lately other mailbox providers will hide the real "User agent" and IP address thus not allowing us to determine the actual email client or the exact location of the recipient.

This is what is reported by Gmail:
Mozilla/5.0 (Windows; U; Windows NT 5.1; de; rv:1.9.0.7) Gecko/2009021910 Firefox/3.0.7 (via ggpht.com GoogleImageProxy)

By Yahoo,
YahooMailProxy; https://help.yahoo.com/kb/yahoo-mail-proxy-SLN28749.html

By Apple when Mail Privacy Protection is active:
Mozilla/5.0

Do email proxies affect geolocation by opens/views?

Yes, they do. Since the real IP address is replaced with a generic one, geolocation reports based on opens will not be 100% accurate. They still however provide a very good indication.

How email proxies affect email clicks?

When a subscriber actually clicks a link in the newsletter the real IP address and user agent are captured. Geolocation reports based on clicks will be more accurate.

However, email proxies tend to follow all hyperlinks in a newsletter for security and spam detection purposes. This inflates the number of clicks reported and distorts your clicks reporting. nuevoMailer uses Safe Tracking Protection to minimize the impact of email proxies on click reporting.

Do email proxies affect all Gmail users?

No, they only affects users opening their email using the web interface and the mobile Gmail app. Users with desktop email clients (such as Outlook) and non-Gmail mobile apps are not affected.
For example, if you are using Outlook to open your Gmail the email client will appear as MS Outlook.

How are email clients reported in nuevoMailer

Due to the reasons mentioned above, you see Gmail and Yahoo Mail Proxy in your email clients report.
Mozilla/5.0 is reported also as a distinct category and this largely attributed to Apple's mail privacy protection (MPP). With the introduction of MPP the share of iPhone and iPad declined and was replaced by Mozilla/5.0.

Email clients chart

Do proxies affect the IP address captured at opt-in?

IPs captured at opt-in forms are the real ones. With nuevoMailer you can do an advanced search, find and segment subscribers based on campaign clicks/opens by city or country and by opt-in city or country.

How should email marketers adapt to these changes?

Marketers need to adjust their reliance on open rates as performance indicators and for extracting geolocation data.

Furthermore, legislation (introduced in 3rd quarter of 2026), in France (CNIL) and Italy (Garante) prohibit the use of tracking pixels for capturing opens without the explicit consent of the recipient. See how nuevoMailer helps you comply with CNIL and Garante.

Shift focus to click-through rates (CTR). Since clicks still capture the real IP and user agent, they remain the most accurate metric for measuring engagement and geolocation.
Collect location data explicitly during sign-up (e.g., "City" or "Country" fields).
Use open rates to gauge broad trends in deliverability and subject line effectiveness, rather than individual subscriber activity.
Utilize other segmentation methods based on other data such as demographics or buyer activity.