How to prevent your email from being classified as Spam

How to prevent your email from being classified as Spam

There are several reasons why emails may end up in the spam folder  and understanding them is essential to ensure proper delivery.
Here are the main ones:

Why do some emails go to the spam folder?

There are several common reasons:

🔐 1. Missing domain authentication (SPF, DKIM, DMARC)

If your domain doesn’t have proper SPF, DKIM, and DMARC records configured, receiving mail servers may not trust your email, sending it to the spam folder.

📝 2. Suspicious content or spam trigger words

Using terms like “free,” “promotion,” “urgent,” “click here,” or “easy money” — especially in the subject line — can trigger spam filters.

📤 3. Bulk sending from a domain with poor reputation

If you're sending many emails at once and your domain or IP lacks a good sending reputation, the emails may be flagged as spam.

🔗 4. Use of shortened or untrusted links

Including links from services like bit.ly or suspicious domains can raise red flags for spam filters.

✉️ 5. Poor formatting or generic content

Emails with only images, no proper signature, or generic, templated text often look like spam to email providers.

⚠️ 6. Sending server issues

If the sending server is misconfigured or its IP address is listed on blacklists, emails are more likely to land in spam.

✅ How to avoid spam filters:

  • Set up SPF, DKIM, and DMARC records.

  • Use clear, professional subject lines.

  • Avoid spammy words and formatting.

  • Add a proper email signature and sender info.

  • Make sure the sending server’s IP is not blacklisted.

  • Test your emails using tools like:


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