Convert or download EML/MSG file from Email from Azure Communication Service

Question

Convert or download EML/MSG file from Email from Azure Communication Service

Arief Budi Santoso 20

Dear All,

We use Azure communication service to bulk sending email to our customer or client customer. But suddenly some our client ask us to provide .eml/.msg file related to their customer. I was searching in azure communication service to know about this, but I still not found related this problem.

Is there possible to convert/download .eml/.msg from email that we send with Azure communication service? if possible, can you tell me documentation or anything related to this.

Thank you before,

Best Regards,

Arief Budi Santoso

Alekhya Vaddepally 1,670 Reputation points Microsoft External Staff Moderator

2025-04-18T11:48:56.98+00:00

Hi Arief Budi Santoso,
We haven’t heard from you on the last response and was just checking back to see if you have a resolution yet. In case if you have any resolution, please do share that same with the community as it can be helpful to others. Otherwise, will respond with more details and we will try to help
Arief Budi Santoso 20 Reputation points

2025-04-18T12:09:39.6633333+00:00

Hi Alekhya Vaddepally,

Sorry for the late reply. Thank you so much to reply and give us recommendation related to this problem. For the first option, it was slighly same idea with me. So I must recreate message with Mailkit or Mimekit like when I send with SMTP server right? Is there any example that I can search or read related to this? For second option, it not possible for us, because target email will be different and azure will be charge us twice to send one email.
Alekhya Vaddepally 1,670 Reputation points Microsoft External Staff Moderator

2025-04-18T13:20:54.9533333+00:00
If you want to recreate the exact email sent through SMTP (including header, attachment, etc.):

Use Mimekit to build a full mimemassage.

Alternatively send it using Smtpclient of Mailkit (using SMTP).

Save the message into a disc or a stream-it gives you a .eml file (no. MSG, which is outlook-specific).

If you need a perfect. MSG, you will need a third-party library to replace .msg (eg aspose.mail or inductionsoft.msg).
Example using MimeKit

using MimeKit; using System.IO; var message = new MimeMessage(); message.From.Add(new MailboxAddress("Sender Name", "sender@example.com")); message.To.Add(new MailboxAddress("Recipient Name", "recipient@example.com")); message.Subject = "Test Subject"; // Create message body var bodyBuilder = new BodyBuilder { TextBody = "This is the plain text version.", HtmlBody = "<p>This is the HTML version.</p>" }; // Optional: Add attachment bodyBuilder.Attachments.Add("path/to/file.txt"); message.Body = bodyBuilder.ToMessageBody(); // Save as .eml using (var stream = File.Create("email.eml")) { message.WriteTo(stream); }

https://github.com/jstedfast/MimeKit/issues/135
https://github.com/jstedfast/MailKit
Alekhya Vaddepally 1,670 Reputation points Microsoft External Staff Moderator

2025-04-21T08:48:42.97+00:00

Hi Arief Budi Santoso, We haven’t heard from you on the last response and was just checking back to see if you have a resolution yet. In case if you have any resolution, please do share that same with the community as it can be helpful to others. Otherwise, will respond with more details and we will try to help
Arief Budi Santoso 20 Reputation points

2025-04-21T09:02:54.03+00:00

Hai Alekhya Vaddepally,

Can I make your first reply related Azure Communication Service Email and option that you have there to become the answer?
Alekhya Vaddepally 1,670 Reputation points Microsoft External Staff Moderator

2025-04-21T09:19:22.48+00:00

Hi Arief Budi Santoso,
yes, you can use my first reply or option as your answer.
As Azure Communication Services is written context and the email reference

This ACS does not support direct .ml/.msg download

Why is that limit exist (security and compliance)

Two practical work -round options:

Produced and savings before sending.

Export through BCC and Melbox/Email Client

Links for devices like Microsoft Documentation and Mimekit
Alekhya Vaddepally 1,670 Reputation points Microsoft External Staff Moderator

2025-04-22T08:31:20.18+00:00

Hi Arief Budi Santoso,
We haven’t heard from you on the last response and was just checking back to see if you have a resolution yet. In case if you have any resolution, please do share that same with the community as it can be helpful to others. Otherwise, will respond with more details and we will try to help

Accepted answer

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Alekhya Vaddepally 1,670 Reputation points Microsoft External Staff Moderator

2025-04-18T11:48:56.98+00:00

Hi Arief Budi Santoso,
We haven’t heard from you on the last response and was just checking back to see if you have a resolution yet. In case if you have any resolution, please do share that same with the community as it can be helpful to others. Otherwise, will respond with more details and we will try to help
Arief Budi Santoso 20 Reputation points

2025-04-18T12:09:39.6633333+00:00

Hi Alekhya Vaddepally,

Sorry for the late reply. Thank you so much to reply and give us recommendation related to this problem. For the first option, it was slighly same idea with me. So I must recreate message with Mailkit or Mimekit like when I send with SMTP server right? Is there any example that I can search or read related to this? For second option, it not possible for us, because target email will be different and azure will be charge us twice to send one email.
Alekhya Vaddepally 1,670 Reputation points Microsoft External Staff Moderator

2025-04-18T13:20:54.9533333+00:00

If you want to recreate the exact email sent through SMTP (including header, attachment, etc.):

Use Mimekit to build a full mimemassage.

Alternatively send it using Smtpclient of Mailkit (using SMTP).

Save the message into a disc or a stream-it gives you a .eml file (no. MSG, which is outlook-specific).

If you need a perfect. MSG, you will need a third-party library to replace .msg (eg aspose.mail or inductionsoft.msg).
Example using MimeKit

using MimeKit; using System.IO; var message = new MimeMessage(); message.From.Add(new MailboxAddress("Sender Name", "sender@example.com")); message.To.Add(new MailboxAddress("Recipient Name", "recipient@example.com")); message.Subject = "Test Subject"; // Create message body var bodyBuilder = new BodyBuilder { TextBody = "This is the plain text version.", HtmlBody = "<p>This is the HTML version.</p>" }; // Optional: Add attachment bodyBuilder.Attachments.Add("path/to/file.txt"); message.Body = bodyBuilder.ToMessageBody(); // Save as .eml using (var stream = File.Create("email.eml")) { message.WriteTo(stream); }

https://github.com/jstedfast/MimeKit/issues/135
https://github.com/jstedfast/MailKit
Alekhya Vaddepally 1,670 Reputation points Microsoft External Staff Moderator

2025-04-21T08:48:42.97+00:00

Hi Arief Budi Santoso, We haven’t heard from you on the last response and was just checking back to see if you have a resolution yet. In case if you have any resolution, please do share that same with the community as it can be helpful to others. Otherwise, will respond with more details and we will try to help
Arief Budi Santoso 20 Reputation points

2025-04-21T09:02:54.03+00:00

Hai Alekhya Vaddepally,

Can I make your first reply related Azure Communication Service Email and option that you have there to become the answer?
Alekhya Vaddepally 1,670 Reputation points Microsoft External Staff Moderator

2025-04-21T09:19:22.48+00:00

Hi Arief Budi Santoso,
yes, you can use my first reply or option as your answer.
As Azure Communication Services is written context and the email reference

This ACS does not support direct .ml/.msg download

Why is that limit exist (security and compliance)

Two practical work -round options:

Produced and savings before sending.

Export through BCC and Melbox/Email Client

Links for devices like Microsoft Documentation and Mimekit
Alekhya Vaddepally 1,670 Reputation points Microsoft External Staff Moderator

2025-04-22T08:31:20.18+00:00

Hi Arief Budi Santoso,
We haven’t heard from you on the last response and was just checking back to see if you have a resolution yet. In case if you have any resolution, please do share that same with the community as it can be helpful to others. Otherwise, will respond with more details and we will try to help

Answer 1

Hi Arief Budi Santoso,

currently, Azure Communication Service Email does not offer a built -in feature to download or change the email originally sent to .ml or .MSG files. The email material is transmitted via SMTP via ACS backend, and once sending, Azure .ml/.msg does not maintain a downloadable copy of the message in the format. This is mostly for privacy and compliance reasons-Azure does not store the real email body for a long time.

Option1: To provide email or .MSG version, you can consider:
Local email log or save before sending the program programmatic (for example, through C# app, logic app, or other services), then you can:
Save the mime content of email locally before sending through ACS.
Use that mime data to generate a .ml file.
Tools such as Mailkit or Mimekit (for .NET) can help sequential email content.
Option2: Export from BCC itself and Mailbox you are sending through a SMTP relay (eg, online or using a certified domain with any other mailbox):
You can BCC an internal mailbox, from that mailbox, export the message to the .EML (Outlook on Web or Thunderbird) or .MSG (Outlook Desktop). https://learn.microsoft.com/en-us/azure/communication-services/quickstarts/email/send-email?tabs=windows%2Cconnection-string%2Csend-email-and-get-status-async%2Csync-client&pivots=platform-azportal if you have any further concerns or queries, please feel free to reach out to us.

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Convert or download EML/MSG file from Email from Azure Communication Service

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