Why Are My Emails Going to Spam? (And How to Fix It)

If your emails keep landing in customers' spam folders, the culprit is almost always one thing: your domain's email authentication isn't set up correctly. It feels mysterious, but it's usually a fixable technical problem, not bad luck. Here's why it happens and how to get back into the inbox.

The #1 cause: missing authentication

Email providers (Gmail, Outlook, etc.) are constantly judging whether your mail is legitimate. They do it largely through three records that should exist on your domain:

• SPF — declares which servers are allowed to send email for your domain.
• DKIM — cryptographically signs your messages so receivers can verify they're really from you.
• DMARC — tells receivers what to do with mail that fails SPF/DKIM.

If these are missing or misconfigured, providers can't confirm your mail is genuine — so they treat it as suspicious and send it to spam. This is by far the most common reason normal business email gets filtered, and fixing it usually solves the problem. (It's a core part of setting up business email properly.)

The other causes

Once authentication is right, a few other things can still send you to spam:

Poor sender reputation

Email providers track your domain's reputation over time. Sending to bad addresses, getting marked as spam, or sudden spikes in volume damage it. A damaged reputation takes consistent good behaviour to rebuild.

Spam-triggering content

Filters react to certain patterns: ALL-CAPS subject lines, "FREE!!!", too many links or images, misleading subjects, and attachments people didn't expect. Write like a person, not a billboard.

Sending from a free or mismatched address

A business blasting mail from @gmail.com, or from an address that doesn't match the sending domain, looks suspicious. Professional email on your own domain is more trusted — by filters and customers alike.

Bad list hygiene

Emailing people who never opted in, or keeping dead and bouncing addresses on your list, hurts deliverability fast. Only email people who want to hear from you, and remove the ones who bounce or never engage.

How to fix it

In order of impact:

1. Fix authentication first. Set up SPF, DKIM, and DMARC correctly. This alone resolves most cases. If you're unsure, this is the one to get a professional to do — it's fiddly and the highest-impact.
2. Send from your own domain, consistently — not a free or random address.
3. Clean up your content — clear subjects, sensible link counts, no spammy phrasing.
4. Mind your lists — only mail willing recipients, and prune bounces and dead addresses.
5. Warm up gradually if you're starting to send in volume — don't blast thousands on day one.

Deliverability is just reputation

The mental model that ties it together: getting into the inbox is about looking trustworthy and sending wanted mail. Authenticate so providers know it's you, send from your own domain, write like a human, and only email people who want it. Do those, and the spam folder stops being your problem.

The bottom line

Emails going to spam is almost always a missing-authentication problem — SPF, DKIM, and DMARC not set up right on your domain. Fix that first and most cases clear up. Then protect your sender reputation: send from your own domain, keep content clean, and only email people who want to hear from you. Deliverability is reputation, and reputation is earned by behaving like a legitimate sender.

If your mail keeps hitting spam, the authentication fix is exactly what we handle — part of our professional email setup. For the whole picture, start with how to set up business email.