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What to do if…
a colleague starts sending aggressive messages outside working hours

Short answer

Stop engaging, save the messages, and report it promptly through your workplace reporting path (supervisor/HR) so it is documented and addressed. If there is any threat of violence or you feel unsafe, prioritize safety and contact emergency services.

Do not do these things

  • Do not argue back or keep the conversation going to “set the record straight”.
  • Do not delete, edit, or selectively forward messages in a way that changes context.
  • Do not meet them alone to resolve it if you feel intimidated or unsafe.
  • Do not post about it publicly or rally coworkers in group chats (it can escalate and complicate investigations).
  • Do not assume “off-hours” means it’s not a workplace issue—especially if it affects work or your safety.

What to do now

  1. Get a calmer pause. Mute the thread/contact and turn on “do not disturb.” If any message suggests immediate harm, call 911 and get to a safer place first.
  2. Preserve evidence (before blocking). Screenshot messages showing names/usernames and timestamps. If it’s on a work platform, save/export the conversation if possible. Write a quick log of incidents (date/time, platform, what was said, any witnesses, impact on you at work).
  3. Stop using personal channels. If they’re contacting your personal number or social accounts, move communication to work-only channels (work email/work chat) and silence personal channels after saving what you need.
  4. Send one boundary message only (optional, and only if safe). Example: “I’m not available outside work hours. Please keep communication professional and work-related. We can address this during work.” Then stop replying.
  5. Report it through your employer’s process right away. Notify your supervisor and/or HR and ask for the complaint to be documented. If your supervisor is involved or you don’t feel safe reporting to them, use an alternate reporting route in your policy (another manager, HR hotline, ethics/compliance line).
  6. Use workplace safety channels if there are threats. If messages include threats, stalking, or intimidation, ask HR/security for immediate steps (for example: a safety plan, a no-contact instruction, changing schedules/work location, escorts, or limiting access).
  7. If you’re union-represented, use your representation rights in investigatory interviews. If management wants to question you in a meeting you reasonably believe could lead to discipline, clearly request your union representative before continuing. (Employers may not remind you of this right.)
  8. If it may be unlawful harassment or discrimination, label it clearly. If the aggression involves protected characteristics (race, sex, religion, disability, etc.), or sexual content, state that in your report. Keep it factual: what happened, when, where (platform), and how it affected your work.
  9. If your employer does not respond or retaliation starts, consider external options. If you believe it involves discrimination/harassment under federal or state law, you can contact the EEOC (or a state fair employment agency). Deadlines can be short, so it can help to reach out early even if you’re not sure yet.
  10. If contact continues or you fear for safety, escalate outside work too. If there are threats or stalking behavior, consider contacting local law enforcement and let your employer know you’ve done so (especially if workplace access is involved).

What can wait

  • You do not need to decide tonight whether to quit, transfer, or pursue a legal claim.
  • You do not need to craft a perfect report right away—saving the messages and making a clear initial report is enough.
  • You do not need to confront them in person to “prove” it’s serious.
  • You can decide later whether to block them everywhere (save evidence first, then choose what helps you feel safe).

Important reassurance

Being rattled by aggressive out-of-hours messages is a normal reaction. Moving this out of private back-and-forth and into a documented workplace process is a protective step that reduces risk and helps prevent escalation.

Scope note

These are immediate first steps to stabilize the situation and reduce harm. Longer-term decisions (formal investigations, accommodations, legal steps) can come later, ideally with support.

Important note

This is general information, not legal advice. If you are in immediate danger, call 911. If you’re unsure how to report safely or you think the situation involves discrimination/harassment, consider speaking with HR, a union representative (if applicable), an employee assistance program, or an appropriate agency.

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