If you are trying to add any user under the message delivery restriction and getting below error you probably want to use the exchange shell  in 2010 to add/remove users from certain distribution groups. It usually throw this error message if you have an invalid user object available on the senders list.

Adding-Accept-Message-Exchange

Couldn’t find  object “UserObject Path”. Please make sure that it was spelled correctly or specify  a different object.

In-order to tackle this you can use below exchange shell commands.

1) This will allow you to view all the users who are allowed to send email to a particular distribution group. Get-DistributionGroup -Identity “MarketingUsers” | select -Expand AcceptMessagesOnlyFrom | ft Name    

2) This command will allow you to add a particular user to the accepted list. Get-DistributionGroup -Identity “MarketingUsers” | Set-DistributionGroup -AcceptMessagesOnlyFrom @{Add=”Renjith”}

3) This command will allow you to remove any invalid user entries. Get-DistributionGroup -Identity “MarketingUsers” | Set-DistributionGroup -AcceptMessagesOnlyFrom @{Remove=”Renjith”}

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