threats

Junk Mail (Spam)

Updated October 16, 2026

Junk mail, commonly called spam, is unwanted email, often sent in bulk. It can include nuisance promotions, deceptive offers, or malicious campaigns. Phishing is a deceptive purpose, while spam describes unwanted messaging; an email can be both. Requested newsletters are not automatically malicious simply because they are frequent.

2 min. read

What do I need to know about Junk Mail (Spam)?

A sudden increase in junk mail does not by itself prove that an account was compromised.
Use the provider’s spam-reporting tools to improve handling. Blocking one address may have limited effect when a campaign changes senders.
For a recognized legitimate mailing list, use its normal unsubscribe process. Treat unfamiliar “unsubscribe” links in suspicious messages as untrusted.
Quarantine and the Junk Email folder are different controls with different access and release rules.

An illustrative example

A user receives dozens of unexpected sign-up confirmations while a purchase notification is buried among them. The response team checks for suspicious transactions or account changes alongside the unwanted mail. It does not assume every volume spike hides fraud, but it avoids treating the flood as only an inbox-cleanup problem.

Practical checks

Report unwanted messages through the mail service and avoid replying to suspicious senders.
Review recent account activity if the volume spike coincides with password resets, purchases, or other unexpected changes.
Have administrators investigate repeated false positives and apply narrow, documented corrections.

Five FAQs about Junk Mail (Spam)

Is all spam phishing?

No. Some spam is unwanted advertising without an attempt to steal credentials or money. Phishing involves deception to induce a harmful action. Malicious campaigns may use bulk spam delivery.

Should I click unsubscribe?

Use unsubscribe for a mailing list you recognize and legitimately joined. For a suspicious or unfamiliar message, use the mail provider’s reporting controls rather than trusting the sender’s link.

Why does spam keep arriving after I block a sender?

Campaigns can rotate addresses and domains. Provider filtering, reporting, and broader campaign analysis are usually more effective than repeatedly blocking individual addresses alone.

Why did a legitimate email go to junk?

Authentication, reputation, message characteristics, or policy can influence placement. Ask the administrator to inspect the verdict and correct the specific issue; avoid a broad security bypass.

Does a spam flood mean I have been hacked?

Not necessarily. Still, check important account and financial notifications when the increase is sudden or unusual. If other compromise indicators appear, escalate them through your response process.