How to add a MailFrom account in Email Communication Services?

Question

How to add a MailFrom account in Email Communication Services?

Jake Woods 25

A new Email Communication Service has been created with a domain, but the "Add" button on the MailFrom page is grayed out. How can email accounts be added for the domain?

There is one in there by default which is the no-reply @ ****.com

I want to add me @ ****.com.

Jake Woods 25 Reputation points

2025-08-06T19:31:55.71+00:00

On the email communication service it says "Add your email domains to your Azure subscription" and when I click on the link to setup a custom domain, it says "A custom domain with the same name already exists." How do I link that domain with this email communication service?
TP 131.6K Reputation points Volunteer Moderator

2025-08-06T19:55:48.5933333+00:00

Hi Jake,

I have to step away for a little while, but when I return I will check back to see if you have resolved this. If not I will help you get it sorted.
Jake Woods 25 Reputation points

2025-08-08T14:09:53+00:00

still hasn't been resolved. Connected Custom Domain is verified. Under the Email Communication Service Overview page it says "Setup a Custom Domain", which I've already done. If I try to set it up again it says "A custom domain with the same name already exists."

It appears the domain exists but the email service doesn't recognize that.

1 answer

Your answer

Jake Woods 25 Reputation points

2025-08-06T19:31:55.71+00:00

On the email communication service it says "Add your email domains to your Azure subscription" and when I click on the link to setup a custom domain, it says "A custom domain with the same name already exists." How do I link that domain with this email communication service?
TP 131.6K Reputation points Volunteer Moderator

2025-08-06T19:55:48.5933333+00:00

Hi Jake,

I have to step away for a little while, but when I return I will check back to see if you have resolved this. If not I will help you get it sorted.
Jake Woods 25 Reputation points

2025-08-08T14:09:53+00:00

still hasn't been resolved. Connected Custom Domain is verified. Under the Email Communication Service Overview page it says "Setup a Custom Domain", which I've already done. If I try to set it up again it says "A custom domain with the same name already exists."

It appears the domain exists but the email service doesn't recognize that.

Answer 1

Jacquelin Martineau-Rousseau 125

Hello Jake,

I went through this a few weeks ago myself. All I had to do was to use Azure CLI instead.

Something like this:

az communication email domain sender-username create --email-service-name <azureCommunicationService_name> --resource-group <resourceGroup_name> --domain-name <customDomainName> --sender-username <newMailFromToAdd> --username <newMailFromToAdd> --display-name "<newMailFromDisplayName>"

See Microsoft documentation here: https://learn.microsoft.com/en-us/cli/azure/communication/email/domain/sender-username?view=azure-cli-latest#az-communication-email-domain-sender-username-create

If this works for you, please accept my answer.

Thanks.

Jake Woods 25 Reputation points

2025-08-06T19:39:04.4266667+00:00

Thanks, very helpful. I think this has to do more with the domain not being connected to the email service and I'm hoping to fix that. Appreciate your answer for an alternative!
TP 131.6K Reputation points Volunteer Moderator

2025-08-06T19:53:27.76+00:00

@Jacquelin Martineau-Rousseau This is nice if you know 100% you will only send very small amount of emails.

In my experience not increasing send quota (which is what documentation says you need to do to enable additional MailFroms) leads to problems in production. For example, some of the time emails go out fine, while in other cases they fail.

At some point people realize a portion of the messages aren't going out, someone starts troubleshooting, and eventually (after substantial time/effort) they figure out the root cause of quota limitation.

In a perfect world the software sending out the messages would be programmed to properly handle the failure code (by throttling/queuing), send out alerts notifying admin, admin would respond, etc., but this is often not the case.

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How to add a MailFrom account in Email Communication Services?

1 answer

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