What Is Email Spam and How to Avoid It
Arnav Jalan
email deliverability
What Is Email Spam and How to Avoid It
Email spam is unsolicited bulk email sent without permission. It clutters inboxes, wastes time, and can carry security threats like phishing attacks and malware.
Key Takeaways
What Is Email Spam? — Spam is any email you did not ask for, sent in bulk to many recipients.
Types of Email Spam
Marketing and Advertising Spam — The most common type.
Phishing Emails — Phishing emails pretend to be from legitimate organizations like banks, tech companies, or government agencies.
Malware Distribution — These emails contain attachments or links that install malicious software on your device.
Scam Emails — Classic scams include:
Here is how to identify spam, protect yourself from it, and keep your own emails from ending up in spam folders.
What Is Email Spam?
Spam is any email you did not ask for, sent in bulk to many recipients. The term comes from a Monty Python sketch where the word "spam" is repeated endlessly, reflecting the repetitive and unwanted nature of these messages.
Spam makes up nearly half of all email traffic worldwide. In 2025, approximately 47% of all emails sent were spam. That is billions of unwanted messages every day.
Most spam is commercial, trying to sell products, services, or scams. Some spam is malicious, attempting to steal information or infect devices with malware.
Types of Email Spam
Type: Marketing spam — Unsolicited product promotions — Low (annoying)
Type: Phishing — Fake emails pretending to be legitimate companies — High (identity theft)
Type: Malware — Emails with infected attachments or links — High (device compromise)
Type: Scams — Fake lottery wins, inheritance, investment schemes — High (financial loss)
Type: Adult content — Inappropriate material — Low to medium
Type: Chain letters — Messages asking you to forward to others — Low
Marketing and Advertising Spam
The most common type. These emails promote products, services, or websites without your consent. They often use exaggerated claims and urgent language to get clicks.
While annoying, marketing spam is usually not dangerous unless it leads to fraudulent websites.
Phishing Emails
Phishing emails pretend to be from legitimate organizations like banks, tech companies, or government agencies. They try to trick you into revealing passwords, credit card numbers, or other sensitive information.
Common phishing tactics:
Fake account alerts ("Your account has been compromised")
Fake invoices or receipts
Fake shipping notifications
Fake password reset requests
For more on recognizing phishing attempts, see our guide on SMS phishing (smishing) and how to protect yourself.
Malware Distribution
These emails contain attachments or links that install malicious software on your device. Common malware types include:
Ransomware (locks your files until you pay)
Spyware (monitors your activity)
Keyloggers (records what you type)
Trojans (gives attackers access to your system)
Never open attachments from unknown senders, especially executable files (.exe, .zip, .scr).
Scam Emails
Classic scams include:
Advance fee fraud ("Nigerian prince" schemes)
Fake lottery or inheritance notifications
Romance scams
Investment fraud
Fake job offers
These schemes all have one goal: separating you from your money.
How to Identify Spam Emails
Spam often has telltale signs. Look for these red flags:
Suspicious Sender Information
Unknown sender or generic name
Email address does not match the claimed organization
Domain is misspelled (amaz0n.com instead of amazon.com)
Random characters in the email address
Questionable Content
Poor grammar and spelling
Generic greeting ("Dear Customer" instead of your name)
Urgent or threatening language
Too-good-to-be-true offers
Requests for personal information
Suspicious Links and Attachments
Hover over links to see the actual URL before clicking
Shortened URLs that hide the destination
Unexpected attachments, especially .exe, .zip, or .scr files
Requests to enable macros in documents
Pressure Tactics
Artificial urgency ("Act now or lose your account")
Threats of negative consequences
Limited time offers
Claims you have won something you never entered
How to Protect Yourself from Spam
Use Spam Filters
Most email providers have built-in spam filters. Make sure yours is enabled:
Gmail: Settings > See all settings > Filters and Blocked Addresses Outlook: Settings > Mail > Junk email Yahoo: Settings > More Settings > Filters
Train your filter by marking spam as spam and legitimate emails as not spam when they are misclassified.
For more on keeping emails out of spam, see our guide on how to avoid email spam filters.
Guard Your Email Address
The less your email address is exposed, the less spam you receive:
Do not post your email publicly on websites or social media
Use a secondary email for signups, newsletters, and purchases
Be cautious about which companies you share your email with
Read privacy policies before submitting your email
Do Not Engage with Spam
Never reply to spam (it confirms your address is active)
Do not click unsubscribe links in obvious spam (they may be tracking pixels or phishing links)
Never click links or download attachments from suspicious emails
Use Strong Security Practices
Enable two-factor authentication on important accounts
Use strong, unique passwords for each account
Keep your software and operating system updated
Install reputable antivirus software
Why Emails End Up in Spam (For Senders)
If you send legitimate emails and they land in spam folders, understanding why helps you fix the problem.
Common Reasons Emails Go to Spam
Reason: No email authentication — Set up SPF, DKIM, and DMARC
Reason: Poor sender reputation — Clean your list, improve engagement
Reason: Spammy content — Avoid trigger words, excessive links
Reason: High bounce rate — Remove invalid addresses
Reason: Low engagement — Send to engaged subscribers only
Reason: Missing unsubscribe link — Always include one
Reason: Purchased email lists — Never use them
For detailed troubleshooting, see our guide on why emails end up in spam.
Email Authentication Protocols
Legitimate senders should implement these authentication protocols:
SPF (Sender Policy Framework): Verifies that the sending server is authorized to send email for your domain.
DKIM (DomainKeys Identified Mail): Adds a digital signature that proves the email has not been tampered with.
DMARC (Domain-based Message Authentication, Reporting, and Conformance): Tells receiving servers what to do with emails that fail SPF or DKIM checks.
These protocols significantly improve deliverability. For implementation guidance, see our email deliverability best practices guide.
Spam Laws and Regulations
Several laws regulate commercial email and spam:
CAN-SPAM Act (United States)
Requirements for commercial email:
Do not use false or misleading header information
Do not use deceptive subject lines
Identify the message as an advertisement
Include your physical address
Provide a clear way to opt out
Honor opt-out requests within 10 business days
GDPR (European Union)
Requires explicit consent before sending marketing emails to EU residents. Violations can result in significant fines.
CASL (Canada)
Requires express or implied consent before sending commercial electronic messages. Has some of the strictest penalties for violations.
Following these regulations is not just legal compliance. It also improves deliverability because email providers look for compliance signals.
Reporting Spam
Reporting spam helps email providers improve their filters and can lead to action against spammers.
How to report:
Use your email provider's "Report spam" or "Mark as spam" button
Forward phishing emails to the impersonated company's abuse department
Report phishing to the FTC at reportfraud.ftc.gov (US)
Spam Traps and Blacklists
What Are Spam Traps?
Spam traps are email addresses specifically designed to catch spammers:
Pristine traps: Addresses that were never used for real communication
Recycled traps: Old addresses that have been abandoned and repurposed
Typo traps: Common misspellings of popular domains
Hitting spam traps damages your sender reputation and can get you blacklisted.
For more on avoiding spam traps, see our guide on staying out of the spam trap.
Email Blacklists
Blacklists are databases of IP addresses and domains known to send spam. Being listed on a blacklist severely impacts deliverability.
Common blacklists include:
Spamhaus
Barracuda
SpamCop
SURBL
If you are blacklisted, you can request removal after fixing the underlying issues. For troubleshooting help, see our email deliverability troubleshooting guide.
Best Practices for Legitimate Email Senders
If you send marketing emails or newsletters, follow these practices to avoid being marked as spam:
Build Your List Properly
Use double opt-in to confirm subscriptions
Never buy or rent email lists
Make signup clear and expectations transparent
Provide easy unsubscribe options
Maintain List Hygiene
Remove bounced addresses immediately
Clean inactive subscribers periodically
Monitor engagement metrics
Segment by engagement level
Send Quality Content
Send what subscribers signed up for
Maintain consistent sending frequency
Personalize when possible
Provide value in every email
For comprehensive email best practices, see our guide on email deliverability tips.
FAQs
What is email spam?
Email spam is unsolicited bulk email sent without the recipient's permission. It includes commercial promotions, scams, phishing attempts, and malware distribution.
How do I stop getting spam emails?
Use spam filters, guard your email address, do not engage with spam, use a secondary email for signups, and report spam when you receive it.
Is it safe to unsubscribe from spam?
Only unsubscribe from legitimate marketing emails you recognize. For obvious spam, clicking unsubscribe can confirm your address is active and lead to more spam.
Why are my legitimate emails going to spam?
Common reasons include missing email authentication (SPF, DKIM, DMARC), poor sender reputation, spammy content, high bounce rates, or low engagement. See our deliverability guides for solutions.
Can spam emails contain viruses?
Yes. Spam emails can contain malware through attachments or links. Never open attachments or click links from unknown senders.
How do I report spam?
Use your email provider's report spam button. For phishing, forward to the impersonated company and report to authorities like the FTC or Anti-Phishing Working Group.
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Frequently Asked Questions
What Is Email Spam?
Spam is any email you did not ask for, sent in bulk to many recipients. The term comes from a Monty Python sketch where the word "spam" is repeated endlessly, reflecting the repetitive and unwanted nature of these messages.
What are the best approaches for marketing and advertising spam?
The most common type. These emails promote products, services, or websites without your consent. They often use exaggerated claims and urgent language to get clicks.
What are the best approaches for phishing emails?
Phishing emails pretend to be from legitimate organizations like banks, tech companies, or government agencies. They try to trick you into revealing passwords, credit card numbers, or other sensitive information.
What is malware distribution?
These emails contain attachments or links that install malicious software on your device. Common malware types include:
What are scam emails?
Classic scams include:
How to Identify Spam Emails?
Spam often has telltale signs. Look for these red flags:
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