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