Even if you follow limits, emails can still land in spam for many reasons:
1. Authentication Issues
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Ensure SPF, DKIM, and DMARC are set up correctly for your domain.
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Missing or misconfigured records make your emails look suspicious.
2. Bad Reputation or Blacklists
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Your IP or domain might be on a blacklist.
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Using a shared IP (e.g., 3rd-party email services) increases risk if others misuse it.
3. Poor Email Content
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Trigger words like “Free,” “Act now,” “Risk-free,” can flag spam filters.
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Excessive images, all-caps, broken HTML, or links to sketchy websites = RED FLAG
4. Low Engagement
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If users often ignore, delete, or mark your emails as spam, Gmail learns and reacts.
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This is part of Gmail's adaptive spam filtering.
5. Unsubscribed or Cold Contacts
- Sending to outdated, purchased, or scraped lists? Gmail might mark it as spam, especially if recipients don’t engage.
Tips to Avoid Spam & Limits
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Warm Up New Accounts: Send gradually when your domain or account is new.
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Monitor Bounce Rates: High bounces = bad signal.
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Use Reputable Email Tools: Platforms like Mailchimp, SendGrid, or MailerLite handle deliverability better than DIY SMTP.
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Use Google Postmaster Tools: Check your domain reputation & delivery issues.
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Make Unsubscribe Links Easy: Required for bulk mail.
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Follow CAN-SPAM or GDPR: Compliance builds trust.
