Overview
You can't send any emails, and when you try to send them, you keep getting an error message that says "Playbooks encountered an error".
Information
This type of error is generally associated with a limit in your Microsoft Exchange Email Server. The following table shows the default values for organizational limits:
| Size limit | Default value | EAC configuration | Exchange Management Shell configuration |
|---|---|---|---|
| The maximum size of a message received | 10 MB | Mail flow > Receive connectors > More options > Organization transport settings > Limits tab > Maximum receive message size (MB) | Cmdlet: Set-TransportConfig Parameter: MaxReceiveSize |
| Maximum size of a message sent | 10 MB | Mail flow > Receive connectors > More options > Organization transport settings > Limits > Maximum send message size (MB) | Cmdlet: Set-TransportConfig Parameter: MaxSendSize |
| Maximum number of recipients in a message | 500 | Mail flow > Receive connectors > More options > Organization transport settings > Limits Maximum number of recipients | Cmdlet: Set-TransportConfig Parameter: MaxRecipientEnvelopeLimit |
| Maximum attachment size for a message that matches the conditions of the mail flow rule (also known as a transport rule) | Not configured | Mail flow > Rules > Add > Create a new rule, or select an existing rule, and then click Edit. Click More options. Use the condition Apply this rule if > Any attachment > size is greater than or equal to, and enter a value in kilobytes (KB). |
Cmdlets: New-TransportRule, Set-TransportRule Parameter: AttachmentSizeOver |
| Maximum message size for a message that matches the conditions of the mail flow rule | Not configured | Mail flow > Rules > Add > Create a new rule, or select an existing rule, and then click Edit. Click More options. Use the condition Apply this rule if > The message > size is greater than or equal to, and enter a value in kilobytes (KB). |
Cmdlets: New-TransportRule, Set-TransportRule Parameter: MessageSizeOver |
Please, confirm that you are not trying to override one of the limits previously configured by contacting the Exchange administrator. The Microsoft Graph throttling guidance article explains the rate limits that MS exchange enforces. For example, the users in your organization should avoid having more than 4 emails scheduled to be sent at the same time using the same exchange mailbox, so throttling rules don't apply to them.
Priyanka Bhotika
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