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Overview
When emails are marked as spam, it is usually due to authentication, reputation, or content issues. Spam filtering is automated and strict, especially for new or misconfigured domains.
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Most common reasons emails go to spam
1. Missing or incorrect DNS authentication
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No SPF record
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DKIM not enabled
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DMARC missing or misconfigured
Receiving mail servers use these records to verify that your emails are legitimate.
2. New domain or mailbox
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New domains have no sending reputation
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Sending large volumes immediately can trigger filters
Recommendation:
Start with low-volume sending and increase gradually.3. Content triggers
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Excessive links or images
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ALL CAPS or aggressive language
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Words commonly associated with spam
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Poorly formatted HTML emails
4. Blacklisted IP or domain
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Past abuse
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Compromised mailbox sending spam
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Shared IP reputation issues
How to improve deliverability
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Ensure SPF, DKIM and DMARC are correctly set
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Use a real “From” address (not noreply@)
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Include plain-text versions of emails
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Avoid sending bulk campaigns from mailbox accounts
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Monitor bounce-back messages
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