Shared Mailbox delegate - block delegate from sending emails

%3CLINGO-SUB%20id%3D%22lingo-sub-382456%22%20slang%3D%22en-US%22%3EShared%20Mailbox%20delegate%20-%20block%20delegate%20from%20sending%20emails%3C%2FLINGO-SUB%3E%3CLINGO-BODY%20id%3D%22lingo-body-382456%22%20slang%3D%22en-US%22%3E%3CP%3EScenario%3A%3C%2FP%3E%3CP%3E%26nbsp%3B%3C%2FP%3E%3CP%3E1%20regular%20mailbox%20for%20user%40contoso.com%3C%2FP%3E%3CP%3E1%20shared%26nbsp%3B%20mailbox%20shared%40contoso.com%3C%2FP%3E%3CP%3E%26nbsp%3B%3C%2FP%3E%3CP%3Euser%20have%20send%20on%20behalf%20rights%20to%26nbsp%3Bshared%26nbsp%3B%20mailbox%20shared%40contoso.com%3C%2FP%3E%3CP%3E%26nbsp%3B%3C%2FP%3E%3CP%3Erequirement%20is%20to%20block%26nbsp%3Buser%40contoso.com%20from%20sending%20emails%20and%20force%20him%20to%20send%20mails%20using%20shared%26nbsp%3B%20mailbox%20shared%40contoso.com%3C%2FP%3E%3CP%3E%26nbsp%3B%3C%2FP%3E%3CP%3Eis%20this%20possible%3F%3C%2FP%3E%3C%2FLINGO-BODY%3E%3CLINGO-LABS%20id%3D%22lingo-labs-382456%22%20slang%3D%22en-US%22%3E%3CLINGO-LABEL%3EExchange%3C%2FLINGO-LABEL%3E%3CLINGO-LABEL%3EOffice%20365%3C%2FLINGO-LABEL%3E%3C%2FLINGO-LABS%3E%3CLINGO-SUB%20id%3D%22lingo-sub-382652%22%20slang%3D%22en-US%22%3ERe%3A%20Shared%20Mailbox%20delegate%20-%20block%20delegate%20from%20sending%20emails%3C%2FLINGO-SUB%3E%3CLINGO-BODY%20id%3D%22lingo-body-382652%22%20slang%3D%22en-US%22%3E%3CP%3E%3CA%20href%3D%22https%3A%2F%2Ftechcommunity.microsoft.com%2Ft5%2Fuser%2Fviewprofilepage%2Fuser-id%2F61448%22%20target%3D%22_blank%22%3E%40Marvin%20Oco%3C%2FA%3E%26nbsp%3B%3C%2FP%3E%3CP%3E%26nbsp%3B%3C%2FP%3E%3CP%3Eyou%20can%20do%20it%20using%20third-party%20tools%2Fservices.%26nbsp%3B%3C%2FP%3E%3CP%3EHave%20a%20look%20at%20%3CA%20href%3D%22https%3A%2F%2Fivasoft.com%2Fchoosefrom365.shtml%22%20target%3D%22_self%22%20rel%3D%22nofollow%20noopener%20noreferrer%20noopener%20noreferrer%22%3ESmartReply%3C%2FA%3E%20cloud%20service.%26nbsp%3B%20It%20seems%20that%20%22Uncoditional%20address%20rewriting%20rule%22%20will%20fit%20your%20requirements.%3C%2FP%3E%3CP%3E%26nbsp%3B%3C%2FP%3E%3CP%3EIf%20you%20run%20only%20Outlook%20for%20Windows%2C%20take%20a%20look%20at%20%3CA%20href%3D%22https%3A%2F%2Fivasoft.com%2Fsetfrom2013.shtml%22%20target%3D%22_self%22%20rel%3D%22nofollow%20noopener%20noreferrer%20noopener%20noreferrer%22%3ESetFrom%3C%2FA%3E%20add-in.%26nbsp%3B%3C%2FP%3E%3C%2FLINGO-BODY%3E%3CLINGO-SUB%20id%3D%22lingo-sub-382478%22%20slang%3D%22en-US%22%3ERe%3A%20Shared%20Mailbox%20delegate%20-%20block%20delagate%20from%20sending%20emails%3C%2FLINGO-SUB%3E%3CLINGO-BODY%20id%3D%22lingo-body-382478%22%20slang%3D%22en-US%22%3E%3CP%3EYou%20mean%20prevent%20him%20from%20sending%20messages%20with%20his%20own%20account%3F%20No%20way%20to%20do%20that%20I'm%20afraid.%20The%20only%20thing%20you%20can%20do%20is%20create%20a%20transport%20rule%20that%20blocks%20the%20messages%20after%20they%20are%20sent%20via%20the%20client.%3C%2FP%3E%3C%2FLINGO-BODY%3E
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Super Contributor

Scenario:

 

1 regular mailbox for user@contoso.com

1 shared  mailbox shared@contoso.com

 

user have send on behalf rights to shared  mailbox shared@contoso.com

 

requirement is to block user@contoso.com from sending emails and force him to send mails using shared  mailbox shared@contoso.com

 

is this possible?

2 Replies
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You mean prevent him from sending messages with his own account? No way to do that I'm afraid. The only thing you can do is create a transport rule that blocks the messages after they are sent via the client.

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@Marvin Oco 

 

you can do it using third-party tools/services. 

Have a look at SmartReply cloud service.  It seems that "Uncoditional address rewriting rule" will fit your requirements.

 

If you run only Outlook for Windows, take a look at SetFrom add-in.