How to Stop Emails Going to Spam in Gmail?

Gmail blocks around 15 billion suspicious emails every day. 

That filtering keeps inboxes safe, but it also catches legitimate emails more often than most people expect.

If your outreach emails keep landing in recipients’ spam folders, it directly hurts your reply rates and your pipeline. And if you are on the receiving end, missing important emails because Gmail flagged them is equally frustrating.

I have worked with cold email tools and deliverability setups for years, and I have seen both sides of this problem. 

What makes it harder now is that Gmail tightened its enforcement in November 2025. It no longer just filters non-compliant emails to spam. It rejects them at the server level before they even reach the recipient.

In this guide, I will cover why Gmail sends emails to spam, how its filter actually works, and 9 fixes that consistently make a difference.

I have also added a deliverability checklist you can use before every campaign.

So, let’s get started.

Why Are My Gmail Emails Going to Spam?

Your emails are going to Gmail’s spam folder due to the following factors:

1. Missing or Incorrect Authentication Records
2. Poor Sender Reputation
3. Low Engagement
4. Spammy Content
5. Sending Volume and Pattern Issues

Let’s understand them!

1. Missing/Incorrect Authentication Records

Gmail uses email authentication records like SPF and DKIM to verify your sender identity.

It shows Gmail that you (as the sender) have taken all the necessary steps to protect the privacy and security of the emails you send and the recipient’s email address.

So, if you’ve not set up your authentication records, your emails will definitely land in spam.

DMARC is the third protocol, and it ties SPF and DKIM together. It tells Gmail what to do if either check fails. If you have not set up DMARC, Gmail sees that as a gap in your email security.

Since November 2025, Gmail has not just filtered unauthenticated emails to spam anymore. It rejects them at the server level with permanent error codes. That means your emails may not reach the recipient at all, not even their spam folder.

2. Poor Sender Reputation

Sender reputation is your “trust score” with Gmail (as well as other ESPs), which it uses to decide where to route your emails. 

And if you’ve faced issues like: 

• A spam complaint rate.
• High bounce rate.
• Inconsistent sending history and volume.

There’s a high chance that your email domain has a poor sender reputation, which means your emails are more likely to land in spam folders. 

You can check your domain reputation through Google Postmaster Tools. The updated version, Postmaster Tools v2, launched in late 2025, now uses a Pass or Fail compliance model instead of the older reputation tiers. 

If your status shows Fail, your emails are at serious risk of being rejected.

As a benchmark, keep your spam complaint rate below 0.1 percent. Gmail’s hard limit is 0.3 percent. In addition to that, keep your bounce rate below 2 percent. Anything higher signals poor list quality to Gmail.

Check out my detailed guide on how to check and improve your email sender reputation to fix this problem.

3. Low Engagement

When recipients don’t open or reply to your emails, or they delete or mark them spam, Gmail will think that you’re not sending emails that provide value or are actually spamming your recipients.

Gmail measures and learns from these engagement metrics – if they’re consistently low, it will automatically start sending them to the spam folder!

There is also the concept of graymail. Graymail refers to emails that are technically legitimate but generate almost no engagement. They are not spam, but they are not wanted either. Gmail’s filters increasingly treat these the same way they treat actual spam.

4. Spammy Content

Gmail’s spam filter “reads” the content of your emails.

Gmail now uses a machine learning system called RETVec to analyze email content. RETVec can detect deliberately obfuscated text, like replacing letters with numbers or using special characters to disguise words.

Google reported this improved spam detection by 38 percent while reducing false positives by 19.4 percent. The filter evaluates context and patterns, not just individual keywords.

If it spots any of the following, your message is far more likely to go to spam:

• Subject lines or copy stuffed with spammy words
• Too many links or large attachments
• Emails with too much image-to-text ratio

5. Sending Volume and Pattern Issues

Gmail monitors your sending behavior over time. If you send from a brand-new domain with no history, a sudden burst of volume looks exactly like spam.

Similarly, going from zero emails to hundreds in a single day, or sending nothing for weeks and then blasting a large batch, raises red flags.

For cold outreach, start new domains at 20 to 30 emails per day and ramp up gradually over two to four weeks. Mature Google Workspace accounts can handle up to 100 per day. Custom SMTP accounts should stay around 20 to 50 per day.

How Does Gmail’s Spam Filter Work?

Gmail evaluates every incoming email through four layers.

Authentication: It first checks whether SPF, DKIM, and DMARC are passing. If any fail, the email can be rejected or sent to spam immediately. Since November 2025, authentication failures on bulk email often result in hard rejections rather than silent spam placement.

Sender reputation: It checks your domain’s trust score, spam complaint history, and compliance status in Postmaster Tools. A poor reputation means the email is already flagged before Gmail reads the content.

Content analysis: Gmail’s AI models, including RETVec, scan for spam patterns, suspicious links, manipulated text, and formatting that matches known spam templates. This goes beyond simple keyword matching. It evaluates context and intent.

Recipient engagement: Gmail checks how the individual recipient has interacted with your emails in the past. If they have ignored, deleted, or reported your messages before, Gmail is more likely to filter future emails from you.

Failing at any single layer can send your email to spam, even if the other three are clean. That is why fixing deliverability requires working on all four areas.

9 Methods to Prevent Emails from Going to Spam Gmail

If you need to know how to stop emails from going to spam in Gmail, check out the following tried-and-tested methods you can use to prevent this from happening:

• Test Inbox Placement Before You Send
• Set Up Strong Email Infrastructure
• Build a Good Sender Reputation
• Keep Your Email List Clean
• Improve Your Email Content
• Encourage Engagement
• Monitor Sending Patterns
• Stay Compliant With Gmail’s Sender Guidelines
• Ask Recipients to Add You to Their Contacts

Let’s get into the details!

Method 1: Test Inbox Placement Before You Send

The best way to prevent emails from going to your spam folder in Gmail is to know where your email will likely end up, even before you send it. 

And tools like Inbox Radar by Saleshandy can help you do that.

It sends your email to trusted test accounts on Gmail, Microsoft 365, and Yahoo, then tells you if it landed in the inbox, spam, or promotions tab.

And it doesn’t just spot what’s wrong, it actually gives you actionable insights on how to fix it. 

For example, if your email contains words that appear spammy, Inbox Radar highlights them and suggests better alternatives, and if you have missed an important authentication step, it flags that too and tells you how to  set it.

After running a placement test, you can then tweak your email and run another test so that you’re confident that your emails will make it to inboxes. 

Method 2: Set Up Strong Email Infrastructure

Email authentication is the foundation of Gmail deliverability. If this is not set up properly, nothing else will make a meaningful difference.

SPF tells Gmail which servers are allowed to send emails on behalf of your domain. Set it up by adding a TXT record in your DNS listing your authorized sending services. Keep total DNS lookups under 10, because exceeding this limit breaks your SPF silently.

DKIM adds a digital signature to every email so Gmail can verify it was not tampered with in transit. Generate a key pair in your email platform, publish the public key as a TXT record in DNS, and use 2048-bit keys instead of 1024-bit.

DMARC ties SPF and DKIM together and tells Gmail what to do when either fails. Publish a DMARC TXT record starting with p=none to collect reports. Once aligned, move to p=quarantine, then to p=reject.

To verify your setup, send yourself an email in Gmail, click the three dots, select “Show Original,” and check that SPF, DKIM, and DMARC all show PASS.

Gmail requires SPF or DKIM for all senders. For bulk senders sending more than 5,000 emails per day to Gmail, all three are mandatory. Since November 2025, failing these checks results in hard email rejections, not just spam placement.

If you do not want to go through manual setup, you can also buy ready-to-send email accounts through an email infrastructure provider that comes with authentication pre-configured.

Method 3: Build a Good Sender Reputation

A good sender reputation means Gmail thinks you’re a legit email sender and that your emails don’t belong in the spam folder.

To build this reputation, you should:

• Maintain a consistent email sending pattern.
• Send personalized emails to boost your engagement metrics. 
• Avoid sudden spikes in the number of emails you’re sending.
• Warm up new or out-of-use domains before using them to send emails.

If you are using a new domain, follow this warm-up schedule before sending at scale:

Week 1: Send 10 to 20 emails per day to contacts who are likely to open and reply. The goal is to build positive engagement signals with Gmail from the start.

Week 2: Increase to 30 to 50 per day. Start mixing in cold contacts. Monitor your bounce rate and spam complaints closely.

Week 3: Ramp to 50 to 80 per day. Check Google Postmaster Tools for any warning signs.

Week 4 onward: Gradually reach your target volume. Pull back immediately if your bounce rate or spam complaints spike.

You can automate this with warm-up tools like TrulyInbox, which integrates directly with Saleshandy. It simulates real email activity from your account to build trust with Gmail automatically.

When you repeat these steps over time, your sender reputation will definitely increase, and your email deliverability will improve. 

Don’t forget to keep checking your domain reputation to ensure that your sender reputation is actually increasing!

Method 4: Keep Your Email List Clean

When Gmail is unable to deliver your email because the recipient’s email address is invalid, it’s considered a “bounce” email. 

Once your account’s bounce rate exceeds 2%, it will negatively impact your sender reputation. As a result, Gmail might start sending your emails to spam.

So, your goal should be to minimize your account’s bounce rate by: 

• Remove invalid or inactive addresses from your email list regularly. Once your bounce rate crosses 2 percent, it starts hurting your sender’s reputation.
• Use an email verification tool to check every address before adding it to a campaign. Sending to unverified addresses is one of the fastest ways to damage your deliverability.
• Watch out for spam traps. These are inactive email addresses designed to catch senders with poor list hygiene. Hitting one can instantly get your domain blacklisted.
• Source contacts from reliable data providers. Saleshandy’s Lead Finder gives you access to 800M+ verified B2B contacts with waterfall enrichment, so you start with clean data instead of cleaning up after the damage is done.

I also suggest avoiding HTML-formatted content as much as possible – it can lead Gmail to think that you’re “hiding” content and thus raise red flags about your email. 

Method 5: Improve Your Email Content

If your Gmail emails are going to spam, one of the most common reasons is that Gmail thinks your emails contain spammy words/links.

Here’s a checklist you can use to avoid Gmail’s spam filters: 

• Write clear, honest subject lines. Do not use RE: or FWD: tricks to fake a reply.
• Keep your text-to-image ratio at 80:20 or higher. Image-heavy emails with little text look like spam to Gmail.
• Include one clear call to action per email. One relevant link is fine. Do not stuff multiple links pointing to different destinations.
• Keep cold emails between 50 and 150 words. Shorter emails get more replies.
• Use plain text or minimal HTML. Heavy templates with multiple fonts and background colors trigger filters.
• Do not use link shorteners like Bitly or TinyURL. Gmail treats shortened URLs as a phishing signal.
• Write in natural language. Avoid ALL CAPS, excessive punctuation, and high-pressure words.

Method 6: Encourage Engagement

When a high percentage of your recipients open, click through, and reply to your emails, it will tell Gmail that you’re sending valuable emails that people want to receive!

To get this maximum “engagement”, I recommend two things: 

• Keep the Copy Short: Recipients will find it easier to read through and reply to emails with 50 to 125 words compared to longer emails.
• Include an Actionable CTA: It will tell the recipient very clearly what you want them to do and increase your chances of getting a response.
• End With a Question: A specific question at the end of your email invites a reply. Replies are the strongest positive engagement signal Gmail tracks.
• Personalize Beyond the First Name: Reference the recipient’s company, a recent milestone, or something specific to their role. Generic personalization does not move engagement metrics the way real relevance does.

Method 7: Monitor Sending Patterns

Gmail observes your email sending pattern and uses it to decide whether you’re a trustworthy/suspicious email sender. 

Here are some practical tips you can follow to maintain a consistent sending pattern: 

• Don’t start sending large batches of emails right away with a new account. 
• If you’re a high-volume sender, consider switching to a dedicated IP address.
• Spread out the no. emails you’re sending across multiple accounts. 

Method 8: Stay Compliant With Gmail’s Sender Guidelines

Gmail introduced specific sender requirements in February 2024. Since November 2025, enforcement has been strict. Non-compliant emails now get rejected at the server level.

What Gmail requires from all senders:

• SPF or DKIM authentication on your sending domain.
• Spam complaint rate below 0.3 percent. The recommended target is under 0.1 percent.
• TLS connection for email transmission.
• Valid forward and reverse DNS records, also called PTR records.
• Do not impersonate Gmail addresses in your From header.

What Gmail additionally requires from bulk senders sending more than 5,000 emails per day to Gmail accounts:

• SPF, DKIM, and DMARC are all three set up with proper alignment.
• One-click unsubscribe through a List-Unsubscribe header on marketing and promotional emails.
• Process unsubscribe requests within 48 hours.

Privacy laws such as GDPR, CAN-SPAM, and CCPA also require you to include an unsubscribe option, provide a physical mailing address, and honor opt-out requests promptly. These rules overlap with Gmail’s own requirements, so compliance with both is now a baseline expectation.

Method 9: Ask Recipients to Add You to Their Contacts

Lastly, you should ask your recipients to add you to their Google contacts list.

It’ll tell Gmail that you’re a trusted email sender and that your emails should be routed to the inbox, not the spam folder.

Pro Tip: Ask your recipients to create a filter with your email address so Gmail always sends them to the inbox.

Email Deliverability Checklist Before You Hit Send

How to Stop Emails You Receive From Going to Spam in Gmail?

Here’s how you can stop the emails you receive from ending up in the spam folder :

• Mark Legitimate Messages as “Not Spam”
• Add Important Senders to Contacts
• Create Filters for Senders

Let's go!

1. Mark Legitimate Messages as “Not Spam”

First, go to your spam folder and open an email that should have landed in your inbox.

Right below the sender’s information, you’ll see a box where you can “Report as Not Spam.” 

Click on this button - it’ll tell Gmail to deliver such emails to the inbox. 

2. Add Important Senders to Contacts

Another thing I suggest is that you add important senders to your Google contacts list. 

Why? Because adding a sender’s email to your contact list is basically the same as adding it to a “Safe Sender List” or “Allow List.”

So, Gmail will always route emails from your contacts to your inbox.

3. Create Filters for Senders (for future)

Lastly, you can also manually tell Gmail not to send specific emails to the spam folder. 

To do this, all you need to do is create a “filter”: 

• Open your Gmail account.
• Click on the gear icon on the right side, and click on “See All Settings.”
• Navigate to “Filters and Blocked Addresses.”
• Click on “Create a New Filter.” 
• Add specifics like:
  • Sender email address.
  • Subject lines.
  • Keywords (include/exclude).
  • Attachment sizes.
  • Dates.
• Click on “Create Filter.”

Gmail will then ask you where you want to route emails that meet the criteria you’ve specified. Click on “Never Send it to Spam.”

And that’s it! 

All the emails that match your filter criteria will never be sent to the spam folder.

Keep Your Emails Out of Gmail’s Spam Folder

If your emails are going to Gmail spam, it comes down to one of five things: broken authentication, poor sender reputation, low engagement, content issues, or erratic sending patterns. Usually, it is a combination of two or three of these.

Start with authentication. Make sure SPF, DKIM, and DMARC are all set up correctly and passing. This is the foundation that everything else depends on.

Next, warm up any new domains before sending at scale. Keep your email list clean and verified. Monitor your compliance status through Google Postmaster Tools regularly.

And before every campaign, run an inbox placement test. It takes a few minutes and shows you exactly where your emails are landing and what needs to be fixed. That single step prevents most deliverability problems before they happen.

Sign up for Saleshandy's free 7-day trial. Run your first inbox placement test.

FAQs

1. Why are my emails suddenly going to spam in Gmail?

The most common cause right now is Gmail's November 2025 enforcement change. Gmail rejects non-compliant emails instead of just filtering them to spam. If your SPF, DKIM, or DMARC setup is broken or missing, that alone can cause a sudden shift. Other triggers include a spam complaint spike, hitting a spam trap from an outdated email list, or another sender on your shared IP getting blacklisted. Run an inbox placement test to identify the specific issue.

2. How does Gmail decide which emails go to spam?

Gmail checks four things in order: authentication (SPF, DKIM, DMARC), sender reputation (domain trust score, spam complaint rates, bounce history), content (AI-powered pattern analysis using RETVec), and recipient engagement (how the individual recipient has interacted with your emails before). Failing any one of these can trigger spam placement.

3. What is Gmail's spam complaint rate limit?

The hard limit is 0.3 percent. If you exceed it, Gmail rejects your emails and you lose access to their delivery support until you stay below 0.3 percent for seven consecutive days. The recommended target is under 0.1 percent. You can monitor your spam complaint rate through Google Postmaster Tools.

4. Do I need SPF, DKIM, and DMARC to send emails to Gmail?

Regular senders need at least SPF or DKIM. Bulk senders who send more than 5,000 emails per day to Gmail accounts need all three. Since Gmail enforces these requirements with hard rejections since November 2025, I recommend setting up all three regardless of your sending volume.

5. How long does it take to warm up a new email domain?

Two to four weeks. Start with 10 to 20 emails per day to engaged contacts, then increase by 15 to 30 emails per week. Automated warm-up tools like TrulyInbox handle this process consistently and integrate directly with cold email platforms like Saleshandy.

6. Can I stop specific emails from going to spam as a Gmail user?

Yes. You have three options. Mark the email as "Not Spam" to train Gmail's filter. Add the sender to your Google Contacts, which works as a safe sender list. Or create a Gmail filter for that sender's address with the "Never send it to Spam" option selected. Creating a filter is the most reliable long-term fix.

7. How do I check where my emails land before sending a campaign?

Use an inbox placement testing tool. Saleshandy's Inbox Radar sends your email to real test inboxes across Gmail, Outlook, and Yahoo and reports exactly where each email lands. It also flags authentication issues, spam trigger words, and content problems so you know what to fix before you send to your actual recipients.

8. Does email warm-up actually improve Gmail deliverability?

Yes. Warm-up builds a positive sending history for your domain, which directly improves your sender reputation with Gmail. Domains that have been properly warmed up typically see 95 to 98 percent inbox placement rates. Skipping warm-up and sending cold email at volume almost always results in immediate spam placement or outright rejection.

9. What are the most common spam trigger words to avoid?

Classic trigger words include "free," "act now," "limited time," "guaranteed," and "winner." But Gmail's AI filter, RETVec, now evaluates overall context and patterns rather than just flagging individual words. In practice, link shorteners, excessive HTML formatting, multiple CTAs, and misleading subject lines are often bigger deliverability risks than any single word.

10. My emails were reaching inboxes before but now they go to spam. What changed?

Something shifted in your technical setup or your sender reputation. The most common causes are hitting a spam trap because your email list contains outdated addresses, a bounce rate spike after importing a new list, another sender on your shared IP getting blacklisted, a DNS change that accidentally broke one of your authentication records, or your spam complaint rate crossing Gmail's 0.3 percent threshold. Start by checking Google Postmaster Tools for compliance failures, then run an inbox placement test to pinpoint exactly where the issue is.