Limits Rate for Sending & Receiving
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Detailed Limits
To ensure the ongoing health of our platform, Proofpoint Essentials imposes limits on the number of messages sent and received, the number of recipients per message, and the size of a message.
If a user exceeds these limits, they may receive an error message, such as:
- You have reached a limit for sending email
- You have exceeded the maximum number of recipients
- You have exceeded the maximum size of a message
Sending Limits
| Limit type | Limit | Status / Response |
|---|---|---|
| Inbound messages per 1 minute period per user. | 200 | 450 4.7.1 Sender address rejected |
| Standard user: Outbound messages per 10-minute period. | 500 | 554 5.5.0 Relay Access denied |
| Standard user: Outbound messages per 24-hour period. | 2,500 | 554 5.5.0 Relay Access denied |
Unregistered user: Outbound messages per 10-minute period.
|
2,000 | 554 5.5.0 Relay Access denied |
Unregistered user: Outbound messages per 24-hour period.
|
10,000 | 554 5.5.0 Relay Access denied |
| Recipients per message | 1,000 | 451 4.5.3 Too many recipients |
| Message size | 100 MB | 552 5.3.4 message file too big |
Exceptions
Proofpoint recommends that organizations who need to send large amounts of mail (newsletters, marketing related emails, etc.) use bulk mail services or programs to handle the delivery of this email. However, outbound mail exceptions can be granted for select users if necessary with justification.
| Limit type | Limit |
|---|---|
| Bulk outbound messages per 10-minute period. | 2,000 |
| Bulk outbound messages per 24-hour period. | 10,000 |