MyMisfah: Exchange 2010 and Exchange 2007 recipients limit

There is an important change compared to Exchange 2003 – Distribution group are treated as one recipient.

We can restrict recipients limit at the following levels:

Organization
Transport server
Receive Connector
Mailbox

So…
Recipient limit at the organization level, we can check this PowerShell command:
Get-TransportConfig | fl MaxRecipientEnvelopeLimit
or in EMC
Organization Configuration | Hub Transport | Global Settings | Transport Settings tab | Transport Settings Properties

And we can set this limit:
Set-TransportConfig-MaxRecipientEnvelopeLimit 4000
At Transport Servers level we can check limit by the following command:
Get-TransportServer | fl Name, PickupDirectoryMaxRecipientsPerMessage
This limit applies only to messages thrown into the Pickup Directory on transport servers. So this setting are not applied to regular mail
We can set this:
Set-TransportServer-identity ‘Server_Name’-PickupDirectoryMaxRecipientsPerMessage 100
At Receive Connector level we can check limit with following command
Get-ReceiveConnector | fl Name, MaxRecipientsPerMessage
This limit applies to messages accepted by a specific Receive Connector
We can set this limit:
Set-ReceiveConnector-Identity ‘ConnectorName’-MaxRecpientsPerMessage 200
And at the end settings for a specific mailbox:
Get-Mailbox ‘Mailbox_Name’ | fl recipientLimits
Unlimited means that the global settings are used.
Or in the EMC in the mailbox properties | Mail Flow Settings tab | Delivery Options properties

We can set this:
Set-Mailbox-identity ‘Mailbox_Name’-RecipientLimits 50
And what about mailboxes limits and the global limits ?
Mailboxes limits always take priority over the global. And not just in the case of restrictions, but also bigger recipient numbers than the global limit.
There is one other place where you should look when determining limits. Especially in environments migrated or coexisting with Exchange 2003.
These are the Global Settings
Run ADSIEdit connect to Configuration
Expand CN = Configuration … | CN = Services | CN = Microsoft Exchange | CN = NazwaOrganizacjEX | CN = Global Settings | choose Message Delivery properties and find the value of msExchRecipLimit

This limit can be changed by using the ESM for Exchange 2003 or Exchange 2007 (SP1) and Exchange 2010 tools. But after changing in the ESM EX 2003 the new value is not visible in the console 2007/2010. Unfortunately, it is used!
In case of conflict, the lower limit is taken.