To stop email harassment, you need to save every message with its full headers, block and report the sender to your email provider, put the harasser on written notice to stop, and then escalate to local police, the FBI’s Internet Crime Complaint Center, or a civil court for a restraining order or damages if the contact continues or involves threats. The order matters. Skipping the evidence step weakens every legal option that comes after it.
When Email Contact Crosses the Legal Line
A single rude message is not illegal. What law enforcement and courts look for is a pattern, sometimes called a “course of conduct,” showing a sustained effort to frighten, intimidate, or cause serious emotional distress. Ordinary rudeness, petty insults, and one-off nastiness almost never meet the legal threshold, no matter how offensive.
What pushes email into criminal territory is intent combined with effect. The sender must knowingly send messages to harass, threaten, or intimidate, and the content or pattern must be serious enough that a reasonable person would feel genuinely alarmed. Threats of physical violence, sexually intimidating content, or repeated contact meant to terrorize you are the clearest examples. Transmitting a threat to injure someone across state lines is by itself a federal felony, even without a broader harassment pattern.1Office of the Law Revision Counsel. 18 USC 875 – Interstate Communications
The federal cyberstalking statute covers anyone who uses an electronic communication service in a course of conduct that places another person in reasonable fear of death or serious bodily injury, or that causes or would reasonably be expected to cause substantial emotional distress.2Office of the Law Revision Counsel. 18 USC 2261A – Stalking You do not need to be physically threatened. Sustained emotional distress from a deliberate email campaign can be enough.
Save the Emails Before You Do Anything Else
The evidence you collect in the first weeks determines whether police can build a case and whether a court will grant a protective order. Treat every harassing email as evidence from the moment it arrives.
Keep every message in its original format. Do not forward harassing emails to friends or family for advice. Forwarding can strip out the header data that carries routing information, server timestamps, and clues about where the message came from. Save messages as PDFs, print hard copies, or take screenshots that capture the full message, the sender’s address, and the date.
Pulling Full Email Headers
Full headers contain technical details investigators can use to trace where a message originated. In Gmail, open the email, click the three-dot menu next to the reply button, and select “Show original.”3Gmail Help. Trace an Email With Its Full Header In Outlook’s desktop app, double-click the message to open it in its own window, click File, then Properties, and look at the “Internet headers” box. In Outlook on the web, click the three-dot menu, choose View, then View message details.4Microsoft Support. View Internet Message Headers in Outlook Copy the full header text and save it with each email.
A reality check on what headers can do. If the sender uses a major webmail provider like Gmail, Yahoo, or Outlook.com, the header will typically show the provider’s server address rather than the sender’s personal IP address. Modern providers strip that information for privacy. You probably cannot unmask an anonymous harasser yourself by reading headers. What the headers do provide is a trail that law enforcement can follow by subpoenaing the provider for account records tied to the originating address.
Keep an Incident Log
Create a written log recording the date, time, and a brief summary of each harassing email. Note whether the message contained threats, sexual content, or demands for money, and record your emotional response at the time. The log helps establish the pattern courts look for and gives investigators a chronological roadmap. Store everything in a password-protected folder with at least one backup in a separate location.
Document the complete exchange, even messages where you responded in ways you later regret. An incomplete record can damage your credibility if the harasser’s lawyer argues you provoked the contact or that the messages are being taken out of context.
Block, Report, and Warn
Block and Report to the Provider
Start with your email provider’s built-in tools. Block the sender’s address and use the “report abuse” function to flag the account. A determined harasser may create new addresses, but consistently blocking and reporting builds a record with the provider that can support later legal action. If the provider shuts the account down, that is another piece of evidence showing the behavior was serious enough to violate the platform’s terms of service.
Send a Cease-and-Desist Letter
Before escalating to police or a court, consider sending a written cease-and-desist letter telling the harasser to stop all contact. It is not a legal order and carries no enforcement power on its own, but it does two useful things. It eliminates any defense that the sender did not know the contact was unwanted, and it creates a clear timestamp showing that any message sent afterward was sent with full knowledge that you wanted no further communication. If you have a physical address for the sender, send the letter by certified mail with return receipt so you have proof of delivery.
Getting Law Enforcement Involved
File a Local Police Report
If the harassment involves threats, continues after you have told the sender to stop, or is escalating in intensity, file a report with your local police department. Bring your organized evidence: the incident log, printed copies of the emails, and the saved header data. Officers need this material to evaluate the situation and open an investigation. Even if police cannot immediately make an arrest, a formal report creates an official record that strengthens any future restraining order petition or criminal referral.
Report to the FBI’s Internet Crime Complaint Center
When harassing emails cross state lines or involve threats serious enough to implicate federal law, file a complaint with the FBI’s Internet Crime Complaint Center (IC3). The IC3 accepts complaints for any crime involving email threats and will ask for your contact information, any financial loss details, whatever you know about the sender, a description of what happened, and email headers if available.5Internet Crime Complaint Center (IC3). FAQ Filing with the IC3 does not replace a local police report. Do both. If you or someone else is in immediate danger, call 911 first.
Getting a Restraining Order
You can petition a court for a civil harassment restraining order that legally prohibits the harasser from contacting you by any means, including email. The process involves filing paperwork with your local court, and in many jurisdictions a judge can grant a temporary order quickly while a full hearing is scheduled. Your saved emails serve as the evidence supporting the petition. Filing fees and procedures vary by jurisdiction, and some courts waive fees for harassment victims who demonstrate financial need. Once an order is in place, any violation by the sender becomes a separate criminal offense.
If the Harasser Is a Coworker or Supervisor
Harassing emails from a coworker, supervisor, or client trigger a different set of obligations that fall on your employer. Under federal law, workplace harassment becomes illegal when the conduct is severe or pervasive enough to create an environment a reasonable person would find intimidating, hostile, or abusive.6U.S. Equal Employment Opportunity Commission. Harassment A single offensive email usually will not meet that bar. A sustained campaign of hostile messages can.
Report the harassment through your company’s internal complaint process first. This is not just a formality. If you skip internal channels and go straight to a lawsuit, the employer can argue it never had a chance to fix the problem. Keep copies of every complaint you file and every response you receive. If your employer ignores the complaint or retaliates against you for making it, you can file a charge with the Equal Employment Opportunity Commission. You have 180 days from the last harassing incident to file, extended to 300 days if your state has its own anti-discrimination enforcement agency.7U.S. Equal Employment Opportunity Commission. Time Limits for Filing a Charge
Suing the Harasser for Damages
Beyond criminal prosecution, you can file a civil lawsuit for the harm the conduct caused. The most common theory is intentional infliction of emotional distress, which requires showing that the sender’s behavior was extreme and outrageous and that it caused you severe emotional harm. A documented campaign of threatening or degrading emails, paired with evidence of its impact on your mental health, sleep, ability to work, or daily functioning, typically meets that standard.
If you win, the court can order the harasser to pay compensatory damages covering therapy costs, lost income, and the emotional suffering itself. In cases where the conduct was especially malicious, punitive damages may also be available. Many federal and state harassment statutes include fee-shifting provisions, meaning the court can order the losing party to pay your attorney’s fees. That matters because it makes cases financially viable for attorneys even when your out-of-pocket losses are modest.
Deadlines You Cannot Miss
Timing gates every option. Federal prosecutors generally have five years from the offense to bring charges under the statutes covering interstate threats and cyberstalking.8United States Department of Justice Archives. Criminal Resource Manual 650 – Length of Limitations Period Civil harassment lawsuits are governed by state statutes of limitations, which typically give you one to three years from the last harassing contact to file suit. State misdemeanor harassment charges usually have to be filed within one to three years as well.
For workplace harassment, the EEOC deadline is 180 days from the last incident, or 300 days if your state has its own enforcement agency.7U.S. Equal Employment Opportunity Commission. Time Limits for Filing a Charge Missing that deadline forfeits your right to bring a federal employment discrimination claim, and it is the deadline people miss most often. Put it on a calendar the day the harassment starts.