2025/01/15 by Maarten Oelering.
Deploying Business-Critical Emails with PowerMTA on Azure: A Bluetooth SIG Case Study
Objective: new email delivery solution
Bluetooth SIG sends hundreds of thousands of automated outbound messages daily and successful email delivery is critical to Bluetooth SIG's operations. Due to various technical constraints, Bluetooth SIG started a RFP process in early 2018 to select and implement a new email delivery solution, the Microsoft Azure hosted PowerMTA
Project Goals: MTA running on Azure
The following RFP project goals were defined:
- select an MTA that can meet the technical requirements;
- design and implement an MTA instance in Window Azure;
- plan for internal staff management post launch;
- engage vendor in post-launch support agreement for deliverability and other services.
Technical Requirements of the MTA
Bluetooth SIG was looking to confirm that the MTA can be implemented with various
requirements such as:
- can be installed and operated according to exacting requirements related to message construction;
- the MTA can send messages following a specific customised structure;
- the solution: a multi-regional, redundant MTA running on Azure.
After a successful Proof-of-Concept, both Bluetooth SIG and Postmastery determined that PowerMTA was the best option. The integration, implementation, and extensive IP warm-up process was completed in two months. The diagram and the Reflector-PMTA email chain was then fully up and running. The picture below shows the current architecture.

Multi regional and redundant Microsoft Azure hosted PowerMTA.
The current system is fully redundant and spans multiple Azure regions. This ensures that Bluetooth SIG remains operational nearly 100% of the time, regardless of outages or planned maintenance.
Takeaways and deciding factors: invaluable email delivery insights
"IP warming was incredibly important in ensuring that we had uninterrupted mail delivery
during the cutover. The PowerMTA configuration created by Postmastery made it effortless
for us to continually adjust the plan and hit our warming goals. Postmastery's delivery
analytics product has been invaluable and given us insights on our delivery that we never had.
Postmastery was easy to work with and rapidly adjusted to our evolving needs."
Jeremy Syme - Program Manager at Bluetooth SIG
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More information
For more information about Postmastery’s PowerMTA, email infra & deliverability services, please send us a message via our contact form. We are always happy to assist!
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