Question 1

What is California B&P Code § 17529.5?

Accepted Answer

California Business and Professions Code § 17529.5 is the state's anti-spam statute that prohibits sending commercial email advertisements from California or to California email addresses if the email contains falsified, misrepresented, or forged header information, or a misleading subject line. It creates a private right of action allowing recipients (or email service providers) to sue for $1,000 per email, with no cap on total damages and no requirement to prove actual harm.

Question 2

What counts as a 'spoofed' domain under § 17529.5?

Accepted Answer

Under § 17529.5, a 'spoofed' domain means the email uses a domain name in the header information that the sender does not own or have permission to use, with the intent to falsify the email's origin. However, legitimate use of third-party email service providers (ESPs) like Mailchimp, SendGrid, or Hive.co does not constitute spoofing, even though the technical headers may reference the ESP's servers rather than your own domain. The key distinction is whether the header information was intentionally falsified versus being a normal artifact of third-party email routing.

Question 3

Does using a third-party ESP like Mailchimp or Hive.co constitute spoofing?

Accepted Answer

No. When a business uses a legitimate ESP to send marketing emails, the technical routing headers naturally reflect the ESP's infrastructure. This is standard email architecture, not spoofing. SPF, DKIM, and DMARC authentication records can prove that the email was sent through authorized channels. Courts have recognized that third-party ESP routing is a normal part of email delivery and does not constitute falsification of header information under § 17529.5.

Question 4

What are the damages under § 17529.5?

Accepted Answer

Damages under § 17529.5 are $1,000 per unsolicited commercial email that violates the statute, with no statutory cap. The plaintiff does not need to prove any actual damages or harm. Attorney's fees are also recoverable. This per-email damages structure can create enormous exposure for businesses that send high-volume email campaigns, which is why high-volume plaintiffs target businesses using these claims.

Question 5

Can I raise CAN-SPAM preemption as a defense?

Accepted Answer

Yes, CAN-SPAM preemption is a significant defense. The federal CAN-SPAM Act (15 U.S.C. § 7707(b)(1)) expressly preempts state laws that regulate the use of email to send commercial messages, except to the extent that state laws prohibit falsity or deception. This means California's § 17529.5 can only survive preemption to the extent it targets actually false or deceptive headers. If the plaintiff's claim is really about unwanted-but-truthful emails, CAN-SPAM preemption may bar the state-law claim entirely.

Question 6

What is a CCP § 128.7 sanctions motion?

Accepted Answer

A CCP § 128.7 sanctions motion is California's equivalent of a federal Rule 11 motion. It allows you to seek monetary sanctions against a plaintiff (and their attorney) who files a complaint that lacks evidentiary support or is brought for an improper purpose, such as harassment or to extract a nuisance settlement. In the context of § 17529.5 cases, sanctions motions are particularly effective against serial plaintiffs who file dozens of nearly identical complaints without conducting adequate pre-filing investigation into whether the emails actually contained falsified headers.

Question 7

How do I respond to a complaint filed by a high-volume plaintiff?

Accepted Answer

First, research the plaintiff's litigation history through court records to identify filing patterns. High-volume plaintiffs often file dozens of nearly identical cases. This filing history is relevant to standing challenges, credibility at trial, and sanctions motions. Your defense strategy should include: (1) challenging standing if the plaintiff cannot show genuine receipt of the emails, (2) demanding full discovery into their filing history, (3) filing a CCP § 128.7 sanctions motion if the complaint lacks adequate pre-filing investigation, and (4) raising CAN-SPAM preemption if the emails were truthfully headered.

Question 8

What evidence should I preserve immediately?

Accepted Answer

Immediately preserve: (1) all email headers and content for the emails at issue, (2) your ESP account data including sending logs, authentication records, and campaign settings, (3) SPF, DKIM, and DMARC configuration records for your domain, (4) any opt-in or subscriber list documentation, (5) contracts and terms of service with your ESP, (6) any prior communications with the plaintiff or their counsel, and (7) DNS records showing domain ownership and configuration. Do not delete your ESP account or allow log data to expire. This evidence is critical for proving your emails were not spoofed and were sent through legitimate, authenticated channels.

Defending Against Email Spam Lawsuits

Just Been Sued Under § 17529.5? Your First Steps Matter

§ 17529.5 in 90 Seconds

What Triggers § 17529.5 Claims

Why These Cases Get Filed

Your Best Defenses

What Not To Do

Email Anti-Spam Defense Guides

California B&P § 17529.5 Defense

CAN-SPAM Federal Preemption

ESP Authentication Defense

Serial Plaintiff Countermeasures

Exposure Calculator

Interactive Tools

§ 17529.5 Exposure Calculator

Critical Mistakes to Avoid

🚫 Don't Delete ESP Data

🚫 Don't Contact Plaintiff Directly

🚫 Don't Assume It's Meritless

🚫 Don't Miss Your Deadline

🚫 Don't Settle Without Analysis

🚫 Don't Ignore Serial Patterns

When Should You Get Attorney Help?