The same email can lead a user from Russia to a landing page with prices in rubles, while a user from Germany may end up on a 404 error page. If you haven't tested the newsletter from different geos, you're working blind: part of your database is losing conversions, and you won't even know it from open and click metrics. In this article, we discuss how to check the correctness of links in emails for different countries using proxies, and what 6 checks need to be performed before each mass send.
Why links in emails lead to the wrong places
Most email platforms and CRMs (Mailchimp, SendPulse, GetResponse, Unisender, Klaviyo) allow you to set up dynamic content and redirects based on the recipient's geo-IP. This is convenient: one email template — and a user from the USA sees prices in dollars, while a user from France sees them in euros with localized text. But this flexibility creates a risk of errors.
The problem is that when testing the newsletter from inside the office, a marketer almost always opens the email from the same IP — their home or work IP. They see the correct version of the landing page, send the newsletter to 50,000 addresses across 10 countries — and some recipients encounter irrelevant content, incorrect currency, or even a page blocked for their region by the hosting provider or CDN (Cloudflare, Akamai often filter traffic by geo).
For arbitrageurs who drive traffic to offers through email newsletters, an error in geo-redirect means wasted budget: there’s a click, but no conversion because the person landed on the wrong geo-version of the landing page. For SMM and email marketers in agencies, this poses a reputational risk to the client — the open report looks good, but sales are not increasing. Hence the rule: links in the newsletter must be tested from IP addresses of the countries where the subscriber base actually resides, not from your own.
Check 1: IP geo-redirect
The first thing to check is whether the geo-redirect works at all and whether it leads to the page you expect. Open the link from the email through a browser with a proxy connected from the required country and check the final URL. If you set up redirects for 8 countries, you need to run the link through at least 8 different IPs — one for each country, and preferably 2-3, to rule out randomness (some services determine geo not only by IP but also by the provider's ASN, and the result may vary within the same country).
A common mistake is that the redirect is only set up for the top 5 countries, while other visitors land on the default version without localization. This is not always bad, but it’s important to know this in advance, rather than finding out from customer complaints.
Check 2: Currency and language of the landing page
Even if the redirect worked correctly and the user was brought to the right domain or language version, it’s worth separately checking the display of price, currency, and units of measurement. Many e-commerce platforms (Shopify, WooCommerce with geolocation plugins) change the currency based on IP, but if the proxy used for testing had a "bad" reputation (data center IP already flagged by bots), the system may revert to the default currency — usually US dollars.
Therefore, for the purity of the test, it is important to use IPs with a good reputation, as similar as possible to an ordinary internet user. Residential proxies are well-suited here — they are provided by real home internet providers and are less likely to trigger anti-fraud systems that could distort the test results.
Check 3: UTM tags and tracking
After clicking the link in the email, check whether the UTM tags are preserved and whether the tracking parameters were lost in the redirect chain. This is especially critical for newsletters tied to affiliate programs or CPA networks: if the click_id or sub_id is lost along the way, the conversion will not be counted, even if the user purchased a product.
Check this separately from different geos, because some CDNs and WAFs (Web Application Firewalls) aggressively clean query parameters for traffic from "suspicious" regions in their view — for example, countries with a high level of fraud according to the protection provider.
Check 4: Blockages and domain availability
The domain to which the link in the email leads may be unavailable in certain countries due to provider blocking, local legislation, or CDN settings that restrict access for entire regions (geo-fencing). This is standard practice for many streaming services, fintech products, and SaaS with jurisdiction limitations.
If you are sending a newsletter to an international database, be sure to check the availability of the target page from at least 10-15 key countries in your audience. For such mass checks, it’s more convenient to use data center proxies — they are faster and cheaper per check, and for the task of "is the domain available," the reputation of the IP is not as critical as speed.
Check 5: Correctness of tracking pixels and redirect chains
Emails often contain not just one direct link, but a chain of redirects: click → email platform tracker → redirect through a link shortening service → UTM overlay → final landing page. Each link in this chain may behave differently depending on the country from which the request is sent. For example, some link shortening services (Bitly, custom redirectors based on Cloudflare Workers) apply geo-logic specifically at this intermediate step, not on the final domain.
To check this, use the developer tools in your browser (Network tab) when opening the email through a proxy from the required country — you will see the complete chain of requests and can understand at which step the geo-logic occurs and whether there are any breaks (404, 500 errors, or infinite redirects).
Check 6: Mobile version and deep links to the app
More than half of emails are opened on smartphones today, and some links are set up for deep linking — directly opening the mobile app rather than the browser version of the site. The logic of "open in the app if installed, otherwise in the browser" is also often tied to geo: in some countries, the brand has an app, while in others, there is only a web version.
To check this scenario, you need not just proxies with the required geo, but emulation of mobile traffic — a real mobile IP from a cellular operator in a specific country. For such tests, arbitrageurs and mobile marketers most often choose mobile proxies, because many deep-link systems and anti-fraud mechanisms of apps check the type of network (mobile/Wi-Fi/data center), not just the country.
How to set up checks via proxies and anti-detect browsers
To avoid mixing cookies and sessions between tests from different countries, it’s better to perform checks not in a regular browser, but in an anti-detect browser — Dolphin Anty, AdsPower, Multilogin, GoLogin, or Octo Browser. This provides two advantages: each check is done in an isolated profile with clean cookies, and you can keep dozens of profiles "per country" constantly without reconfiguring proxies before each test.
Step by step, it looks like this:
- Create a separate profile in the anti-detect browser for each country you need to check (for example, profile "DE," profile "US," profile "BR").
- In the profile settings, specify the proxy for the required geo — insert the IP, port, username, and password, and choose the HTTP(S) or SOCKS5 protocol.
- Check the geo IP before the test using the built-in checker of the anti-detect browser or a third-party IP geolocation service.
- Open the test email (send it to a test inbox connected in this profile, or copy the link from the original newsletter).
- Click each link in the email and note which page it led to, along with the language and currency displayed.
- Repeat for the other country profiles and compile the results into a table for comparison.
Which type of proxy to choose for checking email links
Different checks require different types of IPs. An error in choosing the type of proxy is a common reason why the test "does not reproduce" real user behavior.
| Check Task | Recommended Proxy Type | Why |
|---|---|---|
| Currency, language, landing page personalization | Residential proxies | High IP trustworthiness, no fallback to default due to anti-fraud |
| Domain availability by countries (mass check) | Data center proxies | High speed, low cost per check, geo is more important than reputation |
| Deep link to mobile app | Mobile proxies | Emulation of cellular network, checking "app vs browser" logic |
| UTM and redirect chains for CPA offers | Residential proxies | Close to real user behavior, less chance of triggering CPA network anti-fraud |
Automation of checks: a script for those who want hands-free
If you check links regularly (for example, before each weekly newsletter to 15 countries), manually clicking each link in the anti-detect browser becomes a routine. This part can be automated with a simple script that goes through a list of links and proxies, recording the final URL after all redirects and the HTTP response status.
import requests
links = [
"https://example.com/go?campaign=newsletter_jan",
]
proxies_by_country = {
"DE": "http://user:[email protected]:12321",
"US": "http://user:[email protected]:12321",
"BR": "http://user:[email protected]:12321",
}
for country, proxy in proxies_by_country.items():
try:
resp = requests.get(
links[0],
proxies={"http": proxy, "https": proxy},
allow_redirects=True,
timeout=15,
)
print(f"{country}: status {resp.status_code}, final URL: {resp.url}")
except Exception as e:
print(f"{country}: error — {e}")
The script automatically goes through the redirect chain (the allow_redirects=True parameter) and shows where a user from each country actually lands. The results can be collected in CSV format and compared weekly — this way, you can see if the geo-logic broke after another website update or CDN rules change.
Checklist before launching the newsletter
Before sending a mass newsletter to an international database, go through a short list:
- The link has been checked from at least 3 countries for each geo-segment of the database
- The currency and language of the landing page match the expected ones for each country
- UTM tags and click_id are preserved in the final URL after redirects
- The domain is accessible and does not return 403/404 in any of the target countries
- Deep link correctly opens the app where it should
- The redirect chain does not loop and does not exceed 3-4 steps (otherwise, loading time increases and conversion drops)
Conclusion
A link in an email is not a static URL, but often an entire system of geo-logic, currency settings, and redirects that behaves differently depending on the recipient's country. The only reliable way to ensure that the newsletter works correctly for the entire database is to test the links from real IP addresses of the countries where the email is sent, rather than relying on a single test from your work computer.
If you regularly send newsletters to an international audience, we recommend keeping a set of proxies from different countries handy for quick checks before each launch. For accurate checks of personalization and currency, residential proxies are better suited, while for mass checks of domain availability across dozens of geos, faster and more economical data center proxies are preferable. This approach saves budget on newsletters and reduces the number of customer complaints about "unfamiliar landing pages after clicking."