SMTP Deliverability Issues & Server Improvements - SaaS Product

I collaborated with a client in CET to troubleshoot critical server configurations affecting email functionality and API access within their multi-domain Windows Server environment. The engagement focused on ensuring email continuity when transitioning from an older domain server (Domain1) to a replacement server (Domain4).

1. DNS & AD Configuration Review

- Conducted a live review of DNS settings, replication, and forwarding rules between Domain1 and Domain4 to assess any dependencies.

- Verified Active Directory dependencies to ensure seamless authentication across servers.

2. SMTP & Email Functionality

- Examined SMTP configurations to ensure email traffic could route correctly when Domain1 was turned off.

- Troubleshot email-related issues linked to the transition to Domain4, focusing on maintaining email functionality for client applications.

3. Network & Firewall Verification

- Performed a top-level check on network and firewall settings to rule out barriers affecting API access and email delivery when Domain1 was offline.

Through a high-level troubleshooting session over Zoom, we pinpointed key areas in DNS and SMTP settings that required adjustments to support a seamless transition. Documentation provided to the client outlined suggested configuration tweaks for resolving continuity issues between Domain servers.

- Server Administration: Windows Server, Active Directory

- Networking: DNS, SMTP configurations

- Live Troubleshooting: Zoom, Remote Desktop

This rapid-response session effectively addressed critical dependencies in the client’s multi-domain setup, supporting uninterrupted email functionality and API performance.