Communication Services: Request for Quota Increase — Email Sending Limit Expansion

Since you have already submitted a quota-increase support request, the next step is to update that existing request with the complete quota-review information, rather than start the process again.

Your current limits of 30 emails/minute and 100 emails/hour match the published initial sending limits for verified custom domains. Higher quotas are available for verified custom domains, not Azure-managed domains.1

Information to include in your existing support request

Microsoft’s quota-increase template requests the following details:2

• Company information: company name, website, and a brief business description.
• Service information: Subscription ID, Azure Communication Services resource name, sending domain, and confirmation that the custom domain is configured and currently used for sending.
• Email type: marketing/promotional emails, as you described.
• Requested sending volumes:
  • Per hour: 3,000 emails.
    • Per day: 10,000 emails.
      • Peak per minute: specify this separately. Sending 3,000 emails evenly over an hour requires 50 emails/minute; if you intend to send in bursts, provide the actual peak requirement.
      • Recipient-list source: explain how you obtained the approximately 3,000 recipients’ addresses and how they subscribed or consented to receive the campaign.
      • Unsubscribe and bounce handling: explain how you process unsubscribe requests and remove addresses that repeatedly bounce.

Provide resource identifiers and supporting information privately in the support request. Please do not post recipient lists, credentials, or connection strings here.

What the review considers

Quota increases are not automatically approved. The reviewing team considers sender reputation, delivery failures, and spam/abuse reports.2

There is a discrepancy between the published failure-rate thresholds: the quota-request article specifies below 2%, while the service-limits article specifies below 1% for a high email quota. Use below 1% as the conservative target, and ask your support engineer to confirm the requirement for your request.2​1

Microsoft states that evaluation and approval might take up to 72 hours, especially for requests received on Friday afternoon. This is not a guarantee that your requested quota will be approved.1

After approval, Microsoft recommends gradually increasing sending volume over two to four weeks, while monitoring delivery outcomes to protect your sender reputation.1

Also, sending throughput and recipients per message are separate limits: the published default is 50 recipients per email, so the campaign’s 3,000 recipients should not be placed into one message without a separately approved increase.1

References:

• Quota increase for email domains
• Azure Communication Services limits — Email

Please confirm your peak emails-per-minute requirement and add the completed information to your existing ticket. Then ask the assigned support engineer whether anything remains outstanding for the quota review. Please reach out to assigned case engineer for any clarification/queries.

Thanks