Why Is My Email Going to Spam? 9 Real Reasons + Fixes

9 min read

Why Is My Email Going to Spam — 9 Real Reasons and How to Fix Each

Your carefully crafted email lands in the spam folder. Again. Your open rates are abysmal. Recipients never see your messages. You're shouting into a void.

Here are the 9 most common reasons your emails get flagged as spam — and the exact fix for each one.

1. Your SPF Record Is Missing or Wrong

SPF (Sender Policy Framework) tells receiving servers which mail servers are authorized to send email on behalf of your domain. Without it, ISPs assume you're a spammer.

Gmail and Outlook check SPF on every incoming email. If your SPF record is missing, misconfigured, or returns "fail," your emails get junked immediately.

Check if you have an SPF record:

nslookup -type=TXT yourdomain.com

Look for a record starting with v=spf1.

Common SPF mistakes:

Fix: Add or update your SPF record

For most setups using a third-party service:

v=spf1 include:_spf.google.com include:sendgrid.net -all

Replace _spf.google.com with your email provider's SPF include. Common ones:

If you send from your own server, add your IP:

v=spf1 ip4:203.0.113.10 include:_spf.google.com -all

Test if SPF is working → checkyouremail.online (free, no signup)

2. DKIM Signature Is Failing or Missing

DKIM (DomainKeys Identified Mail) adds a digital signature to your emails. This proves the email wasn't tampered with during transit and actually came from your domain.

Without DKIM, ISPs can't verify your emails are legitimate. With failing DKIM, they know something's wrong.

Check DKIM status:

Send yourself a test email. View the email source/headers. Look for:

DKIM-Signature: v=1; a=rsa-sha256; d=yourdomain.com

If it says dkim=pass in the authentication results, you're good. If it says dkim=fail or dkim=none, you need to fix it.

Fix: Set up DKIM properly

This requires adding a TXT record to your DNS. Your email service provider will give you the exact record.

For Google Workspace:

1. Go to Admin Console → Apps → Google Workspace → Gmail → Authenticate email 2. Generate a new DKIM key 3. Copy the TXT record 4. Add to your DNS: - Name: google._domainkey.yourdomain.com - Value: v=DKIM1; k=rsa; p=[long string]

For SendGrid:

1. Go to Settings → Sender Authentication 2. Domain Authentication → Authenticate Your Domain 3. Add three CNAME records they provide

Wait 24-48 hours for DNS propagation. Test at checkyouremail.online.

3. You Don't Have DMARC Setup

DMARC ties SPF and DKIM together and tells receiving servers what to do if authentication fails. It's the final piece of the authentication puzzle.

Major ISPs now heavily penalize emails without DMARC. Gmail and Yahoo announced in 2024 that DMARC is required for bulk senders.

Check if you have DMARC:

nslookup -type=TXT _dmarc.yourdomain.com

Fix: Add a DMARC record

Start with a monitoring-only policy:

v=DMARC1; p=none; rua=mailto:dmarc@yourdomain.com

Add this as a TXT record at _dmarc.yourdomain.com.

Once you're confident your authentication is solid, upgrade to:

v=DMARC1; p=quarantine; rua=mailto:dmarc@yourdomain.com; pct=100

Then eventually:

v=DMARC1; p=reject; rua=mailto:dmarc@yourdomain.com; pct=100

What each policy means:

Test your DMARC setup → checkyouremail.online

4. Your Domain Reputation Is Damaged

You're sending from a domain that previous owners used for spam. Or you yourself accidentally burned the domain by sending to purchased lists.

ISPs maintain reputation scores for every sending domain. A damaged reputation means automatic spam folder placement.

Check your domain reputation:

A sender score below 70 is problematic. Below 50 is terrible.

Fix: Rebuild domain reputation (or start over)

If your score is below 50, consider using a new domain. Seriously. Recovering a badly burned domain takes months.

If your score is 50-70, you can recover:

1. Stop sending immediately to anyone who hasn't engaged in 90 days 2. Send only to your most engaged recipients for 2 weeks 3. Gradually expand your recipient list 4. Keep engagement rates above 30% 5. Monitor spam complaints — stay under 0.1%

Use a subdomain for marketing emails to protect your main domain:

5. You're Sending Spam-Trigger Content

Your SPF, DKIM, and DMARC are perfect, but your email content looks like spam.

Modern spam filters analyze:

Common content triggers:

Fix: Write like a human

Before/After examples:

Bad subject: 

🚨 URGENT: Free Money!!! Act Now Before It's Too Late!!!

Good subject: 

Sarah, quick question about your email deliverability

Bad body: 

CLICK HERE NOW FOR YOUR FREE GIFT!!!
[giant image with no text]
UNSUBSCRIBE

Good body: 

Hi Sarah,
I noticed your emails might not be reaching your subscribers. 
I recorded a 3-minute video walking through the fix.
Watch here: https://yourdomain.com/fix-deliverability
Best,
John

Keep text-to-image ratio above 60/40. Use your real domain for links, not shorteners. Write in normal sentence case.

Test your content before sending → checkyouremail.online

6. Your IP Address Is Blacklisted

Your sending IP is on one or more email blacklists. This happens when:

Check major blacklists:

Tools like MXToolbox check 100+ blacklists at once. Or use checkyouremail.online for comprehensive checking.

Fix: Get delisted

Find which blacklist you're on. Visit their website. Follow their delisting process:

Spamhaus delisting: 1. Go to spamhaus.org/lookup 2. Enter your IP address 3. If listed, follow the removal instructions 4. Fix the underlying cause first 5. Submit removal request 6. Wait 24 hours

Most blacklists automatically delist after 1-2 weeks if the problem stops. Some require manual removal requests.

Prevent future blacklisting:

7. You're Not Warming Up a New Domain or IP

You registered a domain yesterday and immediately sent 10,000 emails. This is the #1 sign of a spammer.

ISPs see brand new domains/IPs sending high volumes and automatically flag as suspicious.

Fix: Implement proper warmup

Week 1: Send 50 emails/day to your most engaged subscribers Week 2: Send 100 emails/day Week 3: Send 500 emails/day Week 4: Send 1,000 emails/day Week 5-6: Gradually scale to your target volume

During warmup:

For new domains, wait at least 2 weeks before sending any marketing emails. Use the domain for regular business correspondence first.

Test deliverability at each stage → checkyouremail.online

8. Your Engagement Rates Are Terrible

Gmail knows that 90% of your recipients never open your emails. Outlook sees that people immediately delete your messages. These engagement signals destroy your deliverability.

ISPs track:

Low engagement = spam folder.

Fix: Ruthlessly clean your list

Remove anyone who hasn't opened an email in 60 days. Yes, this shrinks your list. Your list size doesn't matter — your engagement rate does.

Re-engagement campaign:

Before removing non-engagers, send one last email:

Subject: Should I keep sending you these?
Hi [Name],
You haven't opened my emails in a while. That's totally fine — 
I don't want to clutter your inbox.
If you want to keep receiving these, click here: [link]
Otherwise, I'll remove you from the list.
Thanks,
[Your name]

Remove everyone who doesn't click. Keep only engaged subscribers.

Better yet, prevent low engagement:

9. You Don't Have an Unsubscribe Link

CAN-SPAM and GDPR require unsubscribe links. More importantly, ISPs look for them. Emails without clear unsubscribe options get flagged.

Worse, if people can't unsubscribe easily, they mark you as spam instead. Spam complaints tank your reputation faster than anything else.

Fix: Add a clear, working unsubscribe link

Place it in the footer:

You're receiving this because you signed up at [website].
Don't want these emails? [Unsubscribe instantly]

Requirements:

Gmail's new requirements (2024) demand a visible unsubscribe link in the email header. Most email service providers handle this automatically.

Putting It All Together

Fix these 9 issues in this order:

1. Authentication first - Add SPF, DKIM, DMARC 2. Clean your list - Remove non-engagers 3. Check blacklists - Get delisted if needed 4. Fix content - Stop using spam-trigger words 5. Implement warmup - If domain/IP is new 6. Monitor engagement - Keep rates healthy 7. Add unsubscribe - Make it obvious 8. Rebuild reputation - Send consistently to engaged users 9. Test everything - Verify fixes worked

Run a complete check at checkyouremail.online to see which of these issues affect you specifically.

Your emails don't land in spam by accident. There's always a reason. Fix the underlying cause, not just the symptom, and your deliverability will improve within days.

Run a free deliverability check right now at checkyouremail.online — no signup, results in 30 seconds.