How to speed up email delivery from Azure Communication Services?

Question

Context:

We use Azure Communication Services in our application to send a One Time Pass (OTP) via email to our customers.

Problem:

When we send out emails via Azure Communication Services, (even when manually using the "Try Email" within the Azure Webportal), the delivery of the email takes on average 10 seconds (and some emails take much longer). Therefore our users need to wait for the email to arrive with the OTP before they can login.

Question:
Is the 10+ seconds normal? And is there anything we can do to improve the email delivery time?

Answer 1

Hi @Eljo Haspels
The average delivery time of 10 seconds for emails sent via Azure Communication Services can vary due to factors like network conditions and email service provider performance. Delays are possible, especially during peak times, but you can take steps to improve delivery times:

•  Gradually increase your email volume over two to four weeks to maintain reliability and improve delivery times.
•  Keep your email failure rate below one percent (1%). High failure rates can lead to throttling or reduced service quality. Monitor and address any issues causing high failure rates.
•  Consider using a custom domain for sending emails to enhance deliverability and speed.
• Optimize your email content for deliverability by avoiding spammy content and following best practices for transactional emails.
• Ensure your SMTP configuration is correct and optimized for performance.
  https://learn.microsoft.com/en-us/azure/communication-services/quickstarts/email/send-email-advanced/throw-exception-when-tier-limit-reached?pivots=programming-language-javascript
  [https://learn.microsoft.com/en-us/answers/questions/1188660/azure-email-communication-service-is-slow-(30-seco](https://learn.microsoft.com/en-us/answers/questions/1188660/azure-email-communication-service-is-slow-(30-seco)
  Overview of Azure Communication Services email Email SMTP support in Azure Communication Services Service limits for Azure Communication Services
  let me know if you have any further assistances.
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