---
title: "Email Security Risks in Affiliate Marketing Campaigns | DuoCircle"
description: "Affiliate email marketing is one of the most stable income channels for affiliates, open rates reach 50% and even more in some industries."
image: "https://www.duocircle.com/images/og-default.png"
canonical: "https://www.duocircle.com/blog/email-security/email-security-risks-in-affiliate-marketing-campaigns/"
---

Quick Answer

Affiliate email marketing produces stable revenue (open rates of 50%+ in some industries) but carries real security risks for both sides. For advertisers, the main risks are email spoofing (attackers forge the From address using domains resembling the brand), click fraud and cookie stuffing (bots simulate clicks or drop tracking cookies to claim commissions), and data breaches from unsecured affiliate channels. Defenses: verify partner affiliates, require SPF, DKIM, and DMARC compliance, monitor domain reputation, and run real-time lead validation. Concrete configuration examples in the body cover SPF (publishing authorized IPs and ESPs with -all rejection), DKIM (2048-bit RSA key with a unique selector, public key in DNS, signed by ESPs like Mailchimp and SendGrid), and DMARC (start at p=none with rua/ruf reporting, then progress to quarantine and reject once data shows alignment is clean). For affiliates, the main risks are spam filters (avoid by complying with CAN-SPAM, building quality lists with double opt-in, configuring SPF/DKIM/DMARC, and using a reputable ESP), spoofing and phishing impersonating advertisers or networks, and being misclassified as fraudulent by an advertiser's detection system.

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![Affiliate Marketing Campaigns](https://media.mailhop.org/duocircle/images/2025/06/sender-policy-framework-7712.jpg) 

Affiliate email marketing is one of the most stable income channels for affiliates, **open rates reach 50%** and even more in some industries, but there are still quite a few obstacles to overcome, from [spam filters](https://www.fortinet.com/resources/cyberglossary/spam-filters) to phishing attacks to fake sign-ups. As an advertiser, you’d like to nullify or at least mitigate all those risks, so you can get purchase-prone leads that match your demographics.

Even as an affiliate, you’re prone to certain email security risks, like email spoofing, [brand impersonation](https://www.securitymagazine.com/articles/101485-brand-impersonation-is-51-of-browser-phishing-attempts), data breaches, non-compliance, and sometimes even false affiliate fraud accusations. You might have the best content, but it might all be useless unless you have robust [fraud prevention](https://phonexa.com/fraud/) protocols that protect your email marketing at all times.

**Read on to learn** to recognize and prevent email security risks in affiliate marketing.

## How Big Are Email Security Risks in 2025?

With advertisers [losing billions of dollars](https://www.statista.com/statistics/1350779/affiliate-marketing-fraud/) due to invalid traffic, and the number of low-quality and fraudulent emails growing at breakneck speed, in the United States alone, around [8 billion spammy emails](https://www.statista.com/statistics/1270488/spam-emails-sent-daily-by-country/) are sent monthly, email security risks are increasing.

But it’s also a battle of sword and shield, with **new anti-fraud solutions** appearing to counter ever more elaborate affiliate fraudsters. So it’s quite possible to prevent affiliate fraud continuously as long as you’re continuously updating your safety protocols and cherry-picking affiliate partners.

[![email marketing](https://media.mailhop.org/duocircle/images/2025/06/spf-record-tester-7126.jpg)](https://media.mailhop.org/duocircle/images/2025/06/spf-record-tester-7126.jpg)

## Email Security Risks in Affiliate Marketing for Advertisers

_Advertisers generally face more risks than affiliates, and email marketing is no exception, because they rely on affiliates to promote their products and services_. To some extent, advertisers can mitigate email affiliate marketing risks by acquiring traffic through affiliate networks rather than directly from affiliates, but even then, [fraud prevention software](https://validadvantage.com/blog/fraud-prevention-solutions) and protocols are a must.

The good news is that, as an advertiser, you can set up the most **elaborate lead qualification conditions**, what leads are qualified for a payout: location, traffic source, gender, purchase history, and other parameters (for call leads, you can set the minimum conversation time). This may become a double-edged sword, though: the tougher it is to generate qualified leads for your affiliates, the fewer of them you’ll get, not to mention some affiliates may not even want to commit.

### Email Spoofing

Email spoofing is when an impostor forges the “From” address or the [email header](https://proton.me/blog/what-are-email-headers) by exploiting vulnerabilities in email protocols that lack inherent sender verification (for example, SMTP). _In practice, the attacker registers domains resembling the advertiser’s, forges an email header to bypass simple spam filters, and sends a fraudulent affiliate email that appears legitimate_.

Like many of the [affiliate marketing fraud](https://phonexa.com/blog/4-ways-to-identify-affiliate-marketing-fraud/) risks advertisers face, email spoofing risks increase proportionally to the number of affiliates you work with. Bigger advertisers may generate traffic with **thousands of affiliates**, each using a different [email service provider](https://www.activecampaign.com/glossary/email-service-provider), creating a large attack surface.

The worst thing is that most customers who receive spoofed emails associate fraud with the **legitimate brand**, which not only costs money but also erodes trust. In spoofed emails, embedded links are usually replaced to redirect traffic to a [malicious website](https://www.bleepingcomputer.com/news/security/hundreds-of-us-news-sites-push-malware-in-supply-chain-attack/) (cloaked URLs) or steal sensitive data and commissions.

**Here’s how advertisers can prevent email spoofing:**

#### Verify Partner Affiliates

_First of all, you should verify the affiliates you’re working with_. The easiest way to do it is by specifying all the fraud prevention requirements in the affiliate agreement: Require affiliates to comply with your email authentication policies (SPF, DKIM, and [DMARC](/resources/what-is-dmarc), along with proper records aligned with your brand) and use **approved domains** for sending affiliate marketing emails.

Likewise, you can use domain reputation monitoring tools like **Barracuda Sentinel or Proofpoint** to check affiliates’ domain reputations for prior abuse. To ensure long-term safety, [track affiliate links](https://coschedule.com/marketing-strategy/affiliate-link-tracking) beyond mere attribution, conduct regular audits of affiliates’ email practices, and integrate affiliate verification software in your tech stack.

[![domain reputation](https://media.mailhop.org/duocircle/images/2025/06/spf-record-1113.jpg)](https://media.mailhop.org/duocircle/images/2025/06/spf-record-1113.jpg)

#### Set up SPF and DKIM Authentication

Sender Policy Framework (SPF) and DomainKeys Identified Mail (DKIM) are [email authentication](/resources/email-authentication) protocols that verify the sender’s identity. 

- SPF specifies which IP addresses are authorized to send emails for a domain, while DKIM adds a cryptographic signature to email headers so the recipient can verify the sender’s domain. Together, [SPF](https://autospf.com/blog/spf-guide-understanding-sender-policy-framework/) and DKIM form the **basic protection layer** and allow building the DMARC protocol on top.

Practical use case: If you’ve noticed [spoofed emails](https://www.securityweek.com/vulnerabilities-enable-attackers-to-spoof-emails-from-20-million-domains/) impersonating your brand, for example, someone is offering fake discounts to steal user data, SPF and [DKIM](/resources/what-is-dkim) authentication can help prevent this fraud.

**Here’s how you can set up the SPF protocol to prevent fraud:**

- Identify legitimate email sources, the \*\*IP address of your email server (\*\*for example, _192.168.1.10_) and the ESPs (and possibly also the CRMs) of your affiliates.
- Create an SPF record. It may look like this: _website.com TXT v=spf1 ip4:192.168.1.10 include:spf.mailchimp.com include:spf.sendgrid.com -all_, where  
   - _ip4:192.168.1.10_ authorizes your server,  
   - _include:spf.mailchimp.com_ and _include:spf.sendgrid.com_ authorize affiliates’ ESPs,  
   - _\-all_ rejects all emails coming from unauthorized IPs.

**Here’s how you can set up the DKIM protocol to prevent fraud:**

- **Generate a 2048-bit RSA key pair** for your domain using OpenDKIM, an ESP’s built-in DKIM generator, or any other DKIM tool. The private key will be stored on your server and shared with the affiliates’ ESPs (MailChimp and SendGrid). The public key published in your DNS will allow recipients to verify signatures.
- Choose a unique selector to identify this newly created key pair, for example, _campaign2025_.
- Configure your email server to sign outgoing emails with the selector campaign2025\. Add the DKIM signature to the email header: _DKIM-Signature: v=1; a=rsa-sha256; d=website.com; s=campaign2025; h=from:to:subject:date; bh=…; b=…,_ where  
   - _d=website.com_ is your domain (signing domain)  
   - _s=campaign2025_ is the selector  
   - _bh=_ is the hash of the email body  
   - _b=_ is the signature generated with the [private key](https://www.techtarget.com/searchsecurity/definition/private-key).
- Provide the selector, _campaign2025_, to Mailchimp and SendGrid via their **DKIM configuration dashboards**, so they sign affiliate emails with it.
- Add a DNS TXT record for the DKIM public key under the selector subdomain: _campaign2025.\_domainkey.website.com TXT v=DKIM1; k=rsa; p=…,_ where  
   - _v=DKIM1_ is the DKIM version  
   - _k=rsa_ is the key type  
   - _p=_ is your [public key](https://www.investopedia.com/terms/p/public-key.asp)

With SPF already in place, DKIM adds a **second layer of authentication**.

[![email fraud](https://media.mailhop.org/duocircle/images/2025/06/spf-validator-7712.jpg)](https://media.mailhop.org/duocircle/images/2025/06/spf-validator-7712.jpg)

### Implement DMARC Policies

Implementing SPF and DKIM does provide partial protection against email fraud, but there are still significant gaps, like the **lack of policy enforcement**, the absence of [domain alignment](https://mapp.com/blog/what-are-aligned-domains/), inconsistencies in email provider behavior, and the inability to identify [bad actors](https://www.cnbc.com/2024/07/20/malicious-actors-trying-to-exploit-global-tech-outage-for-their-own-gain.html).

**Here’s how you can set up the DMARC protocol to prevent fraud:**

- Publish a DNS TXT record under \_dmarc.website.com: _\_dmarc.website.com TXT v=DMARC1; p=none; rua=mailto:[dmarc-reports@website.com](mailto:dmarc-reports@website.com); ruf=mailto:[dmarc-forensic@website.com](mailto:dmarc-forensic@website.com); adkim=s; aspf=s;_ where  
   - _v=DMARC1_ is the DMARC version  
   - _p=none_ is the monitoring mode that logs SPF/DKIM failures without affecting email delivery  
   - _rua=mailto:[dmarc-reports@website.com](mailto:dmarc-reports@website.com)_ and _ruf=mailto:[dmarc-forensic@website.com](mailto:dmarc-forensic@website.com)_ send aggregate and forensic reports to your email addresses (make sure to create them)  
   - _adkim=s_ and _aspf=s_ are strict **DKIM and SPF alignments**.
- Add the DMARC record to your DNS provider (for example, if you’re using Cloudflare, navigate to [DNS settings](https://www.ntchosting.com/encyclopedia/dns/settings/) and add a TXT record for dmarc.website.com: _v=DMARC1; p=none; rua=mailto:[dmarc-reports@website.com](mailto:dmarc-reports@website.com); ruf=mailto:[dmarc-forensic@website.com](mailto:dmarc-forensic@website.com); adkim=s; aspf=s_).

Note that while starting with _p=none_ is necessary to collect data on email sources without risking blocking [legitimate emails](https://www.trendmicro.com/vinfo/us/security/definition/legitimate-bulk-emails), for example, affiliates with misconfigured ESPs, in a few weeks, once you’ve **collected enough reports**, you can change it to stricter enforcements: _p=quarantine_ first to send failed emails to spam and then _p=reject_ to block failed emails altogether.

### Click Fraud & Cookie Stuffing

Click fraud is when an unscrupulous affiliate **generates low-quality clicks** on affiliate links and ads in order to get a commission. As an advertiser, though, you’re only interested in clicks from genuinely interested leads who are likely to convert into paying customers.

In affiliate marketing campaigns, click fraud is usually executed through automated scripts and bots, which simulate browser activity, IP location, and click patterns. Likewise, fraudsters may embed email scripts that drop a **tracking cookie on a user’s device**, [cookie stuffing](https://fastercapital.com/content/Cookie-stuffing--Exposing-the-Hidden-Threat-in-Affiliate-Programs.html), claiming credit for conversions even if the user didn’t interact with the affiliate’s link.

To prevent click fraud in [email affiliate marketing campaigns](https://www.sendx.io/blog/how-to-launch-an-affiliate-campaign), you need robust fraud prevention software that can analyze user activity thoroughly, click frequencies and timing, session duration, device attributes, etc., detect anomalies, and flag suspicious leads so you can verify them manually. _For example, by tracking IP consistency, you can identify proxies, VPNs, or data center IPs commonly used in fake traffic and block traffic from these sources_.

[![vpn](https://media.mailhop.org/duocircle/images/2025/06/spf-record-generator-7781.jpg)](https://media.mailhop.org/duocircle/images/2025/06/spf-record-generator-7781.jpg)

### Other Email Security Risks

_Most advertiser-side risks in email affiliate marketing stem from overreliance on affiliates and have to do with data breaches_. Unsecured email communication can be intercepted, exposing sensitive data like [affiliate marketing email lists](https://phonexa.com/blog/affiliate-marketing-email-list/), and then used to distribute malware, take over the **advertiser’s email account**, or damage their reputation.

Unfortunately, basic [email security](/) measures like using a strong password and multi-factor authentication may not be enough to protect yourself from spoofing, phishing, and click fraud. But you can take it to the next level by employing [real-time validation](https://validrecord.com/) of all inbound web and call leads, comparing the collected data against internal and external data sources.

With **advanced real-time validation software**, you can check every lead at an atomic level, including their origin, domain, device, browser, input methods, and other essential details. _For example, if you’re acquiring auto insurance leads, you can check their driving and claim history and evaluate how likely this lead is to convert into a customer and whether you want to purchase them at all_.

## Email Security Risks in Affiliate Marketing for Affiliates

### Spam Filters

Even if an affiliate is fully compliant with their **program’s terms and conditions**, spam filters are one of the risks they face, especially if they misjudge audiences or ramp up email volumes too quickly, let alone if they’re sending downright spammy emails.

Both ESPs and ISPs can trigger spam filters, so the email in question lands in the [spam folder](https://cybernews.com/news/microsofts-breach-notification-emails-end-up-in-spam-folder/) or is blocked from reaching the recipient. Repeated flagging lowers delivery rates (when the email comes through to the recipient), deliverability rate (when the email lands in the inbox, not the spam folder), and damages the **affiliate’s sender reputation**, making it even harder to send emails.

[![spam folder](https://media.mailhop.org/duocircle/images/2025/06/spf-permerror-1200.jpg)](https://media.mailhop.org/duocircle/images/2025/06/spf-permerror-1200.jpg)

**Here’s how you can avoid spam filters:**

- Ensure CAN-SPAM Act compliance:  
   - Use a legitimate “From” name and email address  
   - Include a **physical postal address** in the email footer  
   - Include an easy-to-find unsubscribe button  
   - Make sure the subject line and the content resonate with the recipient  
   - Notify the recipient that the email is sponsored
- Build a high-quality email list:  
   - Use double opt-in to confirm subscribers’ interest  
   - Collect [email addresses](https://www.signalhire.com/blog/9-ways-to-find-an-email-address-by-phone-number-for-free/) from legitimate sources (don’t buy email lists)  
   - Segment your subscribers and **customize your email content**
- Configure your SPF, DKIM, and DMARC protocols to authenticate your **email domain and prove** to the ISPs that it’s legitimate, and use a reputable ESP.

### Spoofing & Phishing

_Unfortunately, spoofing and phishing work both ways: affiliates may receive phishing emails posing as advertisers or affiliate networks in order to steal their accounts_. Security-wise, the same measures apply: strong email authentication protocols (SPF, DKIM, and DMARC), [multi-factor authentication](https://www.onelogin.com/learn/what-is-mfa), and additional layers like anti-fraud software and **email security gateways**.

[![ multi-factor authentication,](https://media.mailhop.org/duocircle/images/2025/06/dmarc-report-7788.jpg)](https://media.mailhop.org/duocircle/images/2025/06/dmarc-report-7788.jpg)

#### Risks That May Come from Advertisers

**Advertisers rely** not only on affiliates but also vice versa, and tools like an [affiliate analytics dashboard](https://www.redtrack.io/solutions/affiliates/reporting-and-dashboards/) make this partnership more transparent. For example, if the advertiser’s fraud detection system flags legitimate leads as fraudulent, you may not receive the commission and may sustain reputational damage. So again, it works both ways: advertisers face financial losses from low-quality traffic, while affiliates depend on advertisers’ decisions and software.

At the same time, as an affiliate, you have full control over the quality of content, targeting, and posting timing and frequency, as well as choosing **advertisers and affiliate networks**, and this alone can help mitigate the majority of affiliate marketing risks, including [email outreach](https://instantly.ai/blog/email-outreach/) risks.

_Last but not least, whether you’re an affiliate or advertiser, protecting your email affiliate marketing campaigns from fraud boils down to whether you’ve implemented basic safety protocols and integrated robust fraud protection software solutions with your tech stack._

## Topics

DKIMDMARCemail headeremail marketingemail securityspf 

![Brad Slavin](https://media.mailhop.org/dmarcreport/images/team/brad-slavin.jpg) 

Brad Slavin 

General Manager

General Manager at DuoCircle. Product strategy and commercial lead across the email security portfolio.

## Secure your email infrastructure

Protect, authenticate, and deliver. Contact our team to find the right solution.

[Contact Sales](/contact/) [Explore Products](/products/) 

## Related Articles

[  Email Security 3m  What are the best practices to follow for managing DKIM keys?  Oct 25, 2024 ](/blog/email-security/best-practices-to-follow-for-managing-dkim-keys/)[  Email Security 5m  The key differences between Sender Policy Framework and Sender ID  Feb 11, 2025 ](/blog/email-security/the-key-differences-between-sender-policy-framework-and-sender-id/)[  Email Security 6m  Why is email security important in 2025?  Jun 10, 2025 ](/blog/email-security/why-is-email-security-important-in-2025/)[  Email Security 12m  DMARC, SPF, and DKIM in 2026: Why Email Authentication Is Now a Regulatory Requirement, Not Just a Best Practice  Apr 29, 2026 ](/blog/dmarc-spf-dkim-2026-email-authentication-regulatory-requirement-best-practice/)

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```