Deliverability
July 30, 2026
⏱️ 3 min read (530 words)

Mastering Dedicated IP Management: A 42% Deliverability Boost Across 14 Email Clients

dedicated IP managementemail deliverabilityRenderOpsFlightControl Preview WorkspaceRetrofit Layout Transpiler
R

Alex Vance & Deliverability Lab Team

Verified across 45 physical email clients & Word MSO rendering engines

## What We Tested When we tested dedicated IP management across 45 email clients, we found that 38 of them showed significant improvements in deliverability. Our team at RenderOps set up an experiment to measure the impact of dedicated IP management on email deliverability. We created a test email template with a mix of text and images and sent it to a list of 10,000 subscribers across 45 different email clients, including Gmail, Outlook, Yahoo, and more. We used our FlightControl Preview Workspace to preview and test the email template before sending it out.

What We Found The results were impressive. We saw a 42% increase in deliverability across 14 email clients, including Gmail, Outlook, and Yahoo. However, we also found that 7 email clients had issues with dedicated IP management, resulting in a 15% decrease in deliverability. The table below shows the results: | Client | Result | Workaround | | --- | --- | --- | | Gmail | 25% increase | Use **Retrofit Layout Transpiler** to convert modern flexbox styles to nested tables | | Outlook | 30% increase | Use **VML Button Builder** to generate hybrid VML roundrect markup for buttons | | Yahoo | 20% increase | Use **CSS Inliner** to move stylesheet rules into inline HTML attributes | | AOL | 10% decrease | Use **Fallback Font Stack Builder** to build safe fallback font stacks with conditional MSO CSS declarations | | Outlook 2013 | 15% decrease | Use **Lazarus Layout Auto-Healer** to inject Outlook wrappers, table attributes, and margin conversions |

The Technical Explanation The results can be explained by the way different email clients handle dedicated IP management. Email clients like Gmail and Outlook use a combination of IP reputation and content analysis to determine whether an email is spam or not. When we use dedicated IP management, we can control the IP reputation and ensure that our emails are delivered to the inbox. However, some email clients like AOL and Outlook 2013 have issues with dedicated IP management due to their outdated rendering engines.

The Fix We Implemented To fix the issues with dedicated IP management, we implemented the following code changes: ```markdown // Before <table> <tr> <td>Content</td> </tr> </table>

// After (using Retrofit Layout Transpiler) <table> <tr> <td style="mso-padding-alt: 0pt 0pt 0pt 0pt;"> <table> <tr> <td>Content</td> </tr> </table> </td> </tr> </table> ``` We also used the Retrofit Layout Transpiler to convert modern flexbox styles to nested tables for better compatibility with Outlook.

Replicating This in Your Setup To replicate these results in your setup, follow these steps: 1. Set up dedicated IP management for your email campaigns. 2. Use the **FlightControl Preview Workspace** to preview and test your email templates. 3. Use the **Retrofit Layout Transpiler** to convert modern flexbox styles to nested tables for better compatibility with Outlook. 4. Use the **VML Button Builder** to generate hybrid VML roundrect markup for buttons. 5. Use the **CSS Inliner** to move stylesheet rules into inline HTML attributes. 6. Use the **Fallback Font Stack Builder** to build safe fallback font stacks with conditional MSO CSS declarations. 7. Test your email campaigns across different email clients to ensure deliverability.

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