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What Is Spam?
Email Marketing
Updated 18 September 2026
Quick Answer
Spam is unsolicited, generic, mass-sent communication — typically email — sent without genuine relevance or consent, often flagged by email providers and heavily disliked by recipients.
Spam vs. Cold Email — What's the Difference?
| Spam | Cold Email | |
|---|---|---|
| Relevance & targeting | Generic, mass-sent, no genuine relevance to recipient | Ideally targeted, personalized, and relevant to a specific recipient |
Why It Matters
- Being flagged as spam damages a business's sender reputation, potentially causing even legitimate future emails to be filtered out.
- It's often illegal in many regions when sent without proper consent or required opt-out mechanisms.
How It Works
- Generic, mass communication is sent, often without genuine consent or relevance to recipients.
- Email providers and recipients flag it as spam based on patterns and complaints.
- This damages sender reputation, potentially affecting future email deliverability broadly.
Key Takeaways
- Spam is unsolicited, generic, mass-sent communication without genuine relevance or consent.
- Being flagged as spam damages sender reputation for future emails too.
- It's often illegal without proper consent in many regions.
Frequently Asked Questions
How do I avoid being marked as spam?
Only email people who've genuinely opted in, keep your list clean of inactive addresses, and avoid spam-trigger language and excessive frequency.
Is unsolicited email always illegal?
Rules vary by region and by whether the recipient is a business or consumer — check relevant regulations like GDPR or CAN-SPAM before any bulk unsolicited email.
What happens if my emails are marked as spam frequently?
It damages your sender reputation, which can cause even legitimate future emails to be filtered into recipients' spam folders.