My app emails are landing in spam and I don't know why

Spam placement usually comes down to one or more of these:

1. Sender authentication issues

   • Missing or broken SPF, DKIM, or DMARC
   • “From” domain doesn’t align with the sending domain

2. Poor sender reputation

   • New domain/IP with no history
   • Low engagement, lots of bounces, complaints, or inactive recipients
   • Shared sending IP affected by other senders

3. Message/content signals

   • Spammy wording, excessive links, URL shorteners
   • Images with little text, large attachments
   • Broken HTML or suspicious formatting

4. Sending behavior

   • Sudden volume spikes
   • Sending too frequently
   • Mailing people who didn’t opt in or don’t engage

5. Recipient-side factors

   • Gmail/Outlook/Yahoo filtering based on user behavior
   • Users moving messages to spam, which trains the filter

What to check first

• Verify your domain has SPF, DKIM, and DMARC set up correctly
• Make sure your From address uses the same domain you authenticate with
• Check your bounce rate and complaint rate
• Send a test email to Gmail/Outlook and inspect headers
• Look at your ESP’s deliverability dashboard if you use one

Quick fixes

• Warm up sending volume gradually
• Remove invalid/unengaged recipients
• Simplify the email content
• Avoid too many links or suspicious wording
• Use a reputable sending service/IP
• Add a clear unsubscribe link and physical mailing address

If you want, I can help you debug it step by step.

Send me:

• your sending domain
• whether you use an ESP like SES/SendGrid/Mailgun/etc.
• a sample email header
• SPF/DKIM/DMARC records

and I’ll help pinpoint the likely cause.