Email service successfully sending only some emails.

Question

I have been using Azure Communication Services to send emails for a while now. Just this past week I have had intermittent non-deliveries.

I am accessing the email service via python and the api, and each time I do, I get a successful response, but sometimes no email is received. When I change the email body being sent, generally reducing the size, the email is received. Nothing else changes, not the email address, subject line, etc. However, I know that previously the email service was correctly sending emails of equal size.

I hooked up an events grid to try and solve this myself, but that gives me very little information beyond what I am already getting. I get VERY little quality information about what is going on with the email service. When I worked with support before they had vastly more data/information and was able to solve previous issues.

I don't know what more information you might need. Please let me know what more I can provide.

I worked with support via email before, but I guess my support plan changed to only this Q&A service.

Thank you in advance for your help.

Answer 1

Hi @MAKeena ,

Welcome to MS Q&A platform.

check the total email size, including the body and attachments, as ACS has a maximum limit of 4 MB. Reducing the size has shown improved delivery, indicating that the issue could be related to size constraints or content filtering. Additionally, analyze the email content for patterns that might trigger spam filters, such as specific keywords, links, or attachment types. Enable detailed logging in your Python application to capture request and response details, which can help identify any inconsistencies. It is also recommended to test email delivery across different recipients and email providers (e.g., Gmail, Outlook, Yahoo) to determine if the issue is domain-specific. Since Azure Event Grid provides limited diagnostic information.

https://learn.microsoft.com/en-us/azure/communication-services/concepts/service-limits

https://learn.microsoft.com/en-us/azure/communication-services/concepts/troubleshooting-info?tabs=csharp%2Cjavascript%2Cdotnet

https://learn.microsoft.com/en-us/azure/communication-services/concepts/analytics/logs/email-logs https://learn.microsoft.com/en-us/azure/communication-services/concepts/email/email-quota-increase

 If you have any further assistant, do let me know.

If the answer is helpful, please click Accept Answer and kindly upvote it so that other people who faces similar issue may get benefitted from it.