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ACS Email: +Add button disabled for MailFrom addresses on custom domain — how to request quota increase?

Dhawal Raturi 60 Reputation points
2026-05-26T12:43:23.5833333+00:00

Problem

I have Azure Communication Services Email set up with a verified custom

domain

(mail.leanprep.in). The **+Add button for MailFrom addresses is

disabled** —

I can only send from the default DoNotReply@... address and cannot add

custom MailFrom

What I've tried

ure/communication-services/concepts/email/email-quota-increase)

  • Attempted to create a support ticket via portal — the AI assistant deflects to documentation and does not allow ticket creation
  • Attempted via Azure CLI — blocked, requires Standard support plan ($300/mo) which is not available on Azure Sponsorship subscriptions

Setup

  • Subscription type: Microsoft Azure Sponsorship (startup program)
  • Custom domain: mail.leanprep.in (verified, DNS records — SPF, DKIM, DMARC — all configured)
  • Use case: Transactional emails only (OTP, welcome, daily notifications)
  • Requested limits: 500/min, 5000/hr, 20000/day

Questions

  1. Is there a way to submit a quota increase request without a paid support plan?
  2. Can the ACS team enable the MailFrom +Add button directly on this subscription?
  3. Is there an alternative contact path for Azure Sponsorship accounts?

Subscription ID: 6d3c8ab1-6094-42d8-be43-d67ba1588b3b

Azure Communication Services
0 comments

Answer accepted by question author

TP 156.8K Reputation points Volunteer Moderator
2026-05-26T13:48:06.7733333+00:00

Hi,

Please carefully follow my instructions below to submit quota increase request and not get stuck in endless loop. The quota increase request is free.

Once your quota request is approved the +Add button will be enabled so that you can create additional MailFroms.

Please let me know if you have any issue creating case in a comment below and I will assist further. Let me know the exact step you get stuck on and post screenshot(s) if possible.

Please carefully follow instructions below to create a new Service and subscription limits (quotas) request to increase quota for Azure Communication Services.

1. Navigate to this link to start the process:

https://portal.azure.com/#create/Microsoft.Support

2. Enter quota in the box and click Go

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3. Select Service and Subscription Limits (Quotas) / Service and subscription limits (quotas) and click Next

enter image description here

Select your subscription, click Next. For Problem type, scroll down to bottom and select Azure Communication Services Email: Sending Limits, then click Next

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4. Click Create a support request button, as shown

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5. Select Issue type: Service and subscription limits (quotas), Subscription: <subscription that needs quota increase>, Quota type: Azure Communication Services Email: Sending Limits, click Next

support request Problem description tab

6. Open Notepad (or other text editor). Navigate to Email quota increase article, click Copy button in upper right to copy text, and Paste it into Notepad. Add your company info to the file and answer all questions, then save to a .txt file on your computer. You will need this file later.

7. On Additional details tab, click Enter details, select location, resource group, ACS Email domain resource, New Email sending limit you would like to request, confirm request by entering the tier enum (200, 225, 250, 275, 300, etc.) click Save and continue.

User's image

enter image description here

8. Still on Additional details tab, click the blue file folder icon, select the .txt file you created above, and click Open to upload it.

enter image description here

9. Finish filling out Additional details tab, click Next, review information and click Create. You should receive an automated email within a few minutes.

Please click Accept Answer and upvote if the above was helpful.

Thanks.

-TP

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Answer accepted by question author

Golla Venkata Pavani 5,745 Reputation points Microsoft External Staff Moderator
2026-05-26T13:25:25.4033333+00:00

Hi @Dhawal Raturi ,

Thank you for reaching us regarding the issue.

  1. Why the “+Add” button is disabled

Even if your custom domain (e.g., mail.leanprep.in) is fully verified, the“+Add” button for MailFrom addresses remains disabled when the resource is still on the default sending limits (quota tier).

  • By default, ACS Email applies restricted sending limits (sandbox/throttling tier)
  • Under this default tier:
    • You can send emails using the default DoNotReply@... address
    • Adding additional MailFrom (sender usernames) is restricted
  1. How to request a quota increase (supported and free)

You do not need a paid support plan to request a quota increase for ACS Email.

Microsoft documentation confirms that quota increase requests are submitted via Azure Support under “Service and subscription limits (quotas)”, which is a supported path for service limits scenarios. [learn.microsoft.com]
Steps:

  1. Go to Azure Portal > Help + Support
  2. Select Create a support request
  3. Configure:
    • Issue type: Service and subscription limits (quotas)
    • Quota type: Azure Communication Services Email – Sending Limits
  4. Provide:
    • Subscription + ACS Email resource details
    • Custom domain information
    • Requested sending limits (per minute/hour/day)
    • Use case (transactional, OTP, etc.)
  5. Attach the required template details (from Microsoft quota documentation)
  6. Submit the request
  7. Portal limitation / AI assistant issue

If the Azure portal redirects to documentation instead of allowing ticket creation:

  • This is a known portal behavior with the AI assistant flow
  • Workarounds:
    • Use“Switch to old experience” in the support pane (if available)
    • Search for“quota” while creating the request to surface the correct category
    • Ensure you select Service and subscription limits (quotas) (not Technical)
  1. When will the “+Add” button be enabled

Once the quota increase is approved and applied:

  • Your ACS Email resource moves out of the default sending tier
  • The portal will enable the “+Add” button for MailFrom addresses
  • You can then create additional sender addresses such as:
    • ******@domain.com
    • ******@domain.com

Kindly let us know if the above comment helps or you need further assistance on this issue.

Please "Accept" if the information helped you. This will help us and others in the community as well.

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Answer accepted by question author

AI answer

2026-05-26T12:43:38.1766667+00:00
  1. Quota increase without a paid support plan

Yes. Email sending quota increases for Azure Communication Services Email are requested via an Azure support ticket under Service and subscription limits (quotas), and this request type is free. The documented flow is:

  1. Go to the support creation blade in the Azure portal.
  2. Choose issue type Service and subscription limits (quotas).
  3. Set Quota type to Azure Communication Services Email: Sending Limits.
  4. Fill in the requested details and attach the filled-out template from the quota increase article.

The moderator guidance explicitly states that the quota increase request is free and is the prerequisite for enabling the +Add button for additional MailFrom addresses on a custom domain.

If the portal keeps redirecting to documentation or appears to block ticket creation, follow the pattern described in the subscription Q&A: when a support flow says that more information is needed and offers a Return to support ticket button, use that button to go back into the existing ticket and add the required details instead of trying to start a new ticket.

  1. Enabling the MailFrom +Add button

For custom domains, the documented prerequisite to enable the +Add button for additional MailFrom addresses is to first increase the default email sending limit via the quota increase process above. Once the quota increase is approved on the custom domain:

  • The +Add button for MailFrom on the custom domain becomes enabled in the portal.
  • Alternatively, MailFrom entries can be created via Azure CLI or PowerShell, but the recommended path is still to request the quota increase.

Higher quotas and MailFrom flexibility are only available for verified custom domains, not Azure-managed domains.

  1. Alternative contact path for Azure Sponsorship accounts

The available path in the documentation and Q&A is still the standard Azure support request flow using Service and subscription limits (quotas). For this quota type:

  • The request itself is free.
  • It is available even when the subscription is not on a paid support plan, because quota increase is handled under the limits/quotas category.

There is no separate ACS-specific contact channel documented; the escalation path is via the Azure support ticket system using the quota increase flow.

Key operational steps (aligned with the moderator answer and quota article):

  1. Create a Service and subscription limits (quotas) support request for Azure Communication Services Email: Sending Limits.
  2. From the quota increase article, copy the provided template text, fill in all fields (use case, volumes, domain, etc.), and attach it as a .txt file to the ticket.
  3. On the Additional details tab of the ticket, select:
    • Region, resource group, and the ACS Email resource.
    • The new sending limit tier requested (e.g., 200, 225, 250, etc., as per the form).
  4. Submit the request and wait for approval; the reviewing team will consider sender reputation (bounce rate, spam/abuse reports, domain reputation).
  5. After approval, return to the ACS Email custom domain blade; the +Add button for MailFrom should be enabled.

References:

AI-generated content may be incorrect. Read our transparency notes for more information.

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  1. Alex Rabbi 66 Reputation points
    2026-05-26T12:58:30.3633333+00:00

    Hi Dhawal,

    I recently had to go through this, and the only way to get it done is by raising a support ticket using the link below: https://azure.microsoft.com/en-gb/support/create-ticket/

    Regards,

    Alex

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