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Deliverability and Inbox Placement

Executive Overview​

Deliverability is the measure of how successfully your emails reach your recipients' primary inboxes rather than being diverted to a spam or junk folder. At Clearbox, we handle the complex server infrastructure for you, but maintainining a high "Sender Reputation" requires a partnership between our technology and your sending habits.

This guide explains how to ensure your professional communications are always trusted by global mail providers like Gmail and Outlook.

1. The Three Pillars of Inbox Success​

To get your mail delivered, three elements must work in harmony:

  • Authentication (The "Digital ID"): Proving that you are who you say you are via SPF, DKIM, and DMARC settings.
  • Sender Reputation: How other mail servers view your domain based on your history. If you send high-quality mail that people want to read, your reputation stays high.
  • Engagement: Do your recipients open, click, and reply to your emails? High engagement tells mail providers that your content is valuable.

2. Common Challenges & Professional Solutions​

Issue: My emails are going to the Spam folder​

This is usually a sign that your "digital ID" is missing or your content looks suspicious to automated filters.

  • The Fix: Ensure your [Email Authentication] (SPF/DKIM) is verified in your Clearbox Dashboard.
  • Content Check: Avoid "spam-heavy" language (e.g., "ACT NOW," "FREE MONEY"), excessive links, or using too many large images without accompanying text.
  • Permission: Only send mail to people who have "opted-in" to hear from you.

Issue: High "Bounce" Rates​

A "Bounce" occurs when an email cannot be delivered.

  • Permanent (Hard) Bounces: These happen when an email address doesn't exist. Action: Remove these addresses from your list immediately to protect your reputation.
  • Temporary (Soft) Bounces: These occur when a recipient's inbox is full or their server is temporarily down. Action: Clearbox will automatically try to resend these for a period of time.

Issue: Emails are "Throttled" or Delayed​

To protect the reputation of all users, Clearbox maintains specific sending limits.

  • The Limit: Each mailbox is permitted to send up to 380 emails per hour.
  • The Strategy: If you are sending a large company newsletter, schedule it to send in "waves" rather than all at once. If you have a time-sensitive campaign that requires higher volume, please contact support to discuss a dedicated sending setup.

3. Best Practices for Business Owners​

Maintaining a healthy "Inbox Placement" is an ongoing process. Follow this checklist to stay in good standing:

  1. Maintain List Hygiene: Regularly remove inactive or "bouncing" email addresses from your marketing lists.
  2. Make it Easy to Leave: Always provide a clear "Unsubscribe" link for newsletters. It is much better for a user to unsubscribe than to mark your email as "Spam."
  3. Consistent "From" Address: Use a consistent name and address (e.g., news@yourdomain.com) so that recipients and filters recognize you over time.
  4. Monitor Your Logs: Use the Delivery Logs in your Admin Console to spot sudden spikes in failures or complaints.

4. Technical Support & Monitoring​

Clearbox provides the tools you need to investigate delivery issues independently:

  • DMARC Reports: These reports show you if anyone is attempting to "spoof" or fake your email address.
  • Delivery Logs: View exact timestamps and server "reply codes" to see exactly why a specific message wasn't delivered.

Need an Expert Review?​

If your business is experiencing a sudden drop in email engagement or high spam rates, our Deliverability Specialists can perform a "Domain Audit." We will review your settings and content to help restore your inbox placement.