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INFO: MailMarshal Cloud Service Limits

 

This article applies to:

  • MailMarshal Cloud

Question:

  • What are the service limits for the MailMarshal Cloud service?

Information:

The limits described below apply to all MailMarshal Cloud customers. These limits are designed to maintain performance and stability of the MailMarshal Cloud system for all customers.

Domains

  • Maximum number of domains per customer: 50
  • The customer must be the owner of all domains configured in their MailMarshal Cloud tenancy. 

Stale Domains

Configured customer domains must direct inbound mail (MX) to the MailMarshal Cloud service.

  • After 30 days not pointing to MailMarshal Cloud, the domain may be disabled in MailMarshal Cloud.
  • After 60 days not pointing to MailMarshal Cloud, the domain may be deleted from MailMarshal Cloud.
  • Any customer with no active domains may be disabled (after 30 days with no active domains).

Mail limits

  • No bulk email: MailMarshal Cloud may not be used for bulk email transmission. This is a standard policy with cloud email services.
    • Bulk email includes, but is not limited to, customer invoices, marketing material, sales lead generation tools (cold-call) and newsletters.
    • Customers should either send this material directly, or engage with dedicated email marketing services to send out their bulk mail campaigns.
Maximum message size: 100MB

Receiving limits

Receiving limits apply to the number of messages that a user or group can receive per hour. When the receiving limit has been exceeded, any emails sent to that mailbox will receive a non-delivery report stating that the mailbox has exceeded the maximum delivery threshold. After one hour, the limit will refresh and the mailbox will once again be able to receive messages.
  • 3600 messages per hour
Sending limits

Message rate limits determine how many messages a user can send from their account within a specified period of time. This limit helps prevent over consumption of system resources by a single sender. If a user submits messages at a rate that exceeds the limit, the messages will be rejected and the client will need to retry.
  • 1800 messages per hour

Maximum messages per day per user:
  • Outbound: 2500
  • Inbound: 2500 valid messages (excluding blocked/unsolicited messages)

Blocked Senders limit

Addresses in end user Blocked Senders lists that have not triggered a block in 60 days will be purged.


MailMarshal Cloud KB article Q21041

Last Modified: August 21, 2025

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