Feature Limits and Capability Restrictions

The following table outlines the limits on both inbound and outbound messages.

Table 1. Message Limits

Per Message



50 MB

Number of recipients per message

500 recipients

The following table details the limits on End User Quarantine console settings.

Table 2. End User Quarantine Limits

Per Seat


Approved sender list entries

100 entries

Blocked sender list entries

100 entries

Retention period for quarantined messages

30 days

The following table shows message retention information.

Table 3. Retention Schedule


Retention Period

Quarantined email messages (all regions)

30 days

Message tracking information

90 days

Message queue when customer MTA is unavailable

Up to 10 days