Why are my transactional emails going to spam?

Transactional emails usually land in spam because inbox providers don’t trust the sender, the message content looks risky, or recipients are signaling low engagement. The most common causes are:

1. Missing or broken email authentication

Make sure these are correctly set up:

• SPF
• DKIM
• DMARC

If any of these fail, mail providers may treat your messages as suspicious.

2. Sending from a low-reputation domain or IP

If your domain or sending IP is new, shared with bad senders, or has a poor history, inbox providers may route mail to spam.

3. Inconsistent “From” addresses

Using different sender domains, subdomains, or display names can reduce trust. For transactional mail, keep the sender identity consistent.

4. Content triggers

Even transactional emails can look spammy if they include:

• Too many links
• URL shorteners
• Spammy phrases like “act now,” “limited time,” “free”
• Large images with little text
• Broken HTML or malformed MIME formatting

5. Poor list hygiene

If you’re sending to invalid, old, or unengaged addresses, bounce rates and spam complaints can hurt deliverability.

6. User behavior

If recipients:

• delete without opening
• move messages to spam
• ignore your emails repeatedly

then inbox providers learn that your mail may not be wanted.

7. Sending infrastructure issues

Problems such as:

• incorrect reverse DNS
• mismatched HELO/EHLO
• no TLS
• shared IP abuse
• sudden volume spikes

can all affect deliverability.

8. The email is not clearly transactional

If the message mixes transactional content with marketing content, providers may classify it as promotional or spam.

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What to check first

1. Authentication: SPF, DKIM, DMARC pass
2. Spam folder tests: Use tools like GlockApps, Mail-Tester, or inbox placement tests
3. Headers: Look for SPF/DKIM/DMARC results and any “spam” clues
4. Domain reputation: Check if your domain/IP is listed or has poor reputation
5. Content: Remove promotional language and simplify formatting

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Best practices for transactional email

• Send from a dedicated subdomain like mail.example.com
• Keep content simple and expected
• Use consistent sender names and addresses
• Include plain-text + HTML versions
• Avoid marketing copy in password resets, receipts, and alerts
• Monitor bounces, complaints, and inbox placement

If you want, I can help you troubleshoot it step by step if you share:

• your sending provider,
• a sample email header,
• and whether SPF/DKIM/DMARC are set up.