How do I improve inbox placement for app emails?

Improving inbox placement for app emails usually comes down to three things: sender reputation, user engagement, and technical setup. Here’s a practical checklist:

1) Use a proper sending domain

• Send from a dedicated domain or subdomain for app mail, e.g. mail.yourapp.com
• Don’t send transactional emails from a random free email provider address
• Make sure the “From” name is recognizable and consistent

2) Authenticate your email

Set up:

• SPF
• DKIM
• DMARC

These help mailbox providers trust your messages and reduce spoofing risk.

3) Warm up new sending domains/IPs

If you’re starting with a new domain or IP:

• Begin with small volumes
• Send to your most engaged users first
• Increase volume gradually over days/weeks

4) Keep complaint and bounce rates low

• Remove invalid addresses quickly
• Use double opt-in where appropriate
• Don’t keep mailing people who never engage
• Make unsubscribe easy for non-transactional mail

5) Send relevant, expected mail

Inbox providers reward engagement:

• Segment users by behavior
• Only send emails people expect
• Avoid blasting the same message to everyone

6) Separate transactional and marketing mail

Use different streams/domains for:

• Password resets, receipts, alerts
• Marketing, promos, newsletters

That way, a dip in marketing performance won’t hurt critical app emails.

7) Monitor reputation and delivery

Track:

• Delivery rate
• Bounce rate
• Spam complaint rate
• Open/click engagement
• Gmail Postmaster Tools, Microsoft SNDS, etc.

8) Improve email content

Avoid spammy patterns:

• Too many links/images
• Excessive capitalization or punctuation
• Misleading subject lines
• URL shorteners or suspicious links

Make emails plain, clear, and useful.

9) Make technical signals consistent

• Use a consistent “From” address
• Match domain alignment between SPF/DKIM/DMARC
• Use valid reply-to settings
• Ensure your headers and message IDs are well-formed

10) Test deliverability

Use seed tests and inbox placement tools to see where your mail lands:

• Inbox
• Promotions
• Spam
• Missing entirely

If you want, I can also give you a step-by-step deliverability setup for transactional app emails or a troubleshooting checklist for Gmail/Outlook inbox placement.