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Email Deliverability Knowledge

Email Deliverability: Keeping Your Emails Out of Spam

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šŸ“§ Email Deliverability: Keeping Your Emails Out of Spam

Understanding email deliverability is essential for making sure your emails land in the right place—your subscribers' inboxes. It’s tricky, but once you get the hang of it, you'll be sending emails that actually get opened. Here’s a breakdown of what’s going on behind the scenes.


🚫 Why Do Inbox Providers Filter or Block Emails?

Inbox providers like Gmail, Yahoo, and Outlook receive a ton of mail every day—over 90% of which is spam. Spam filters exist to protect users from unwanted emails, and inbox providers use smart algorithms to decide which emails make it to the inbox and which ones get flagged as spam. These algorithms are constantly looking at the positive vs. negative signals they’re getting from senders (like you!).


🌟 What Are Positive Signals?

When someone interacts with your emails in a good way, it sends a positive signal that you’re sending wanted mail. These signals include:

  • Opening your emails

  • Clicking links inside your emails

  • Marking your email as important or starring it

The more positive signals you get, the better your emails will perform!


āš ļø What Are Negative Signals?

If not enough people are opening your emails, it’s a sign that your content may not be resonating. Inbox providers are also paying attention to:

  • Bounce Rate: When emails are sent to invalid addresses, the email ā€œbouncesā€ back. High bounce rates signal poor list hygiene.

  • Spam Rate: This is the big one—if a lot of people mark your email as spam, inbox providers take notice. Even a small spam rate (like 0.08% of your emails) can hurt deliverability.

The key is to minimize bounces and keep spam complaints low.


šŸ›‘ Understanding Spam Complaints

There are three main reasons people mark your emails as spam:

  1. They didn’t expect to hear from you

  2. They’re getting too many emails from you

  3. They tried to unsubscribe, but you kept emailing them

If you’re seeing more than 1 complaint per 1,000 emails, it’s time to look into why and make changes.


šŸ“‰ How to Keep Your Bounce Rate Low

A hard bounce happens when an email address is invalid, and this can damage your reputation with inbox providers. If your bounce rate goes over 2%, inbox providers start questioning the quality of your list.

Tip: Run your list through an email validation service to weed out invalid or inactive addresses. This helps keep bounce rates low and improves your deliverability.


šŸŒ… Creating a Sunset Policy

A sunset policy means you don’t keep emailing people who are no longer engaging with your content. If a subscriber hasn’t opened or clicked on your emails in 4-6 months, it might be time to remove them from your list.

Why? Inactive subscribers increase the risk of hitting spam traps—special email addresses used by spam filters to catch bad senders.


🚨 What Are Spam Traps?

Spam traps are email addresses that are specifically created to catch spammers. They don’t belong to real users but exist for the sole purpose of identifying bad senders.

There are 3 types of spam traps to watch out for:

  1. Pristine Spam Traps: Created specifically to catch spammers (often from purchased lists).

  2. Typo Spam Traps: Common email domain typos like gmial.com or yahooo.com could actually be traps.

  3. Recycled Spam Traps: These come from inactive email addresses that were once real but are now used as traps after the user stopped engaging.


šŸ”“ Staying Off Blocklists

A blocklist is a real-time list of domains and IPs flagged for spammy behavior. If your email domain or IP gets added to one, your emails are likely to get blocked or sent straight to spam. Avoiding spam traps and keeping complaints low will help you stay off these lists.

If you do end up on a blocklist, you’ll need to follow their instructions to get off it, or your emails will continue to be blocked.


āœ… Recap: How to Stay in Good Standing with Inbox Providers

  1. Send to subscribers who opted in—never buy lists!

  2. Don’t email inactive subscribers—keep your list fresh.

  3. Make it easy to unsubscribe—don’t force your audience to stay if they’re not interested.

  4. Validate your email lists—keep bounce rates low.

  5. Minimize spam complaints—find the cause and fix it ASAP.

With these tips, you’ll be on your way to improved deliverability and better results from your email marketing campaigns.

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