Why is My Email Being Marked as Spam?

Jan 20, 2021
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Welcome to Key For Designs' Learning Center, where we offer valuable insights and expert advice on various topics related to website development and the online business world. In this article, we will explore the reasons behind emails being marked as spam and provide you with practical solutions to avoid this issue.

Understanding Email Deliverability

As a business or website owner, effective communication with your customers is crucial. Email remains one of the primary means of communication, but sometimes, your emails may end up in the recipient's spam folder. This can negatively impact your business reputation and customer engagement. Understanding email deliverability is the first step towards resolving this issue.

Reasons for Emails Being Marked as Spam

There are several reasons why emails get classified as spam by email service providers (ESPs) or email clients. Here are some common factors that contribute to your emails being flagged:

  • Poor Sender Reputation: If your email server has a poor sender reputation, ISPs may filter your emails as spam. Maintaining a good sender reputation is essential to ensure high deliverability rates.
  • Unauthenticated Emails: Lack of proper email authentication, such as SPF, DKIM, and DMARC records, can signal to ESPs that your emails are not legitimate, leading to spam classification.
  • High Spam Complaint Rate: Excessive spam complaints from recipients can harm your sender reputation. Keeping your email list clean and sending relevant, permission-based emails is crucial.
  • Poor Content Quality: Emails containing excessive use of promotional language, suspicious attachments, or misleading subject lines are more likely to be treated as spam.
  • IP Address Blacklisting: If your email server's IP address is on a blacklist, ISPs may automatically send your emails to the spam folder.

Tips to Improve Email Deliverability

Now that we've identified the common reasons behind emails being marked as spam, let's discuss some effective strategies to improve email deliverability:

Create a Strong Sender Reputation

Building a strong sender reputation is vital to ensure your emails are not mistaken for spam. Follow these best practices:

  • Authenticate Your Emails: Implement SPF, DKIM, and DMARC authentication to verify your email's legitimacy and boost deliverability.
  • Use a Dedicated IP Address: Consider using a dedicated IP address to prevent the reputation of other senders on shared IP addresses from affecting your email deliverability.
  • Maintain a Good Sender Score: Regularly monitor your sender score using reputable email deliverability tools. Take necessary steps to improve it if required.

Focus on Content Quality

Creating engaging and relevant email content plays a significant role in avoiding spam filters. Follow these guidelines:

  • Write Concise and Clear Subject Lines: Avoid deceptive or overly promotional subject lines. Focus on creating subject lines that accurately reflect the content of your emails.
  • Personalize Your Emails: Tailor your emails to the recipient's preferences and interests. Including personalized elements can enhance engagement and reduce the chances of your emails being marked as spam.
  • Avoid Spam Trigger Words: Be cautious when using words or phrases commonly associated with spam. This includes excessive use of exclamation marks, terms like "free" or "limited-time offer," and using all caps in the subject or body of the email.
  • Provide an Unsubscribe Option: Include a clear and easy-to-find unsubscribe link in your emails. Making it effortless for recipients to opt-out can prevent spam complaints.

Maintain a Healthy Email List

Regularly cleaning and managing your email list helps ensure you're sending emails to engaged recipients who want to receive your content. Consider the following:

  • Remove Inactive Subscribers: Periodically remove subscribers who haven't engaged with your emails for an extended period. This helps maintain a healthy list and reduces the chances of spam complaints.
  • Implement Double Opt-In: Require subscribers to confirm their email addresses through a verification process. Double opt-in reduces the likelihood of spam traps and invalid email addresses on your list.
  • Segment Your Email List: Categorize subscribers based on their interests and preferences. Sending targeted content to specific segments improves engagement and reduces the chances of your emails being marked as spam.


Understanding the reasons behind emails being marked as spam and implementing effective strategies to improve email deliverability is crucial for any business or website owner. By following the tips outlined in this article, you can optimize your email campaigns and ensure your messages reach the intended recipients' inboxes.

At Key For Designs, we specialize in professional website development and offer expert advice on email deliverability. Contact us today to learn more about our services and how we can help you optimize your email marketing efforts.