Whats the Best Way to Restrict Sending E-Mails to Certain Groups of People?

We have an external Sales force and other groups of users that I would like to apply this too. They all have our company exchange / ad accounts. user@company.com

A long time ago I created a dynamic distribution list so only certain users can email distribution list and this works fine. However, If a regular employee selects the whole company address book (we only have one address book) is there a way to prevent that employee from being able to email the sales / other users directly?

Whats the best way to approach this?

Exchange 2013, most all users use Outlook 2010 or 2013.

thanks,
SteveAsked:
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Will SzymkowskiSenior Solution ArchitectCommented:
The best way to lock this down is to create a Mail Enabled Security Group and then add this group to the Allowed Users on the distribution group. Only users within this group will have the ability to send email to this distribution group. This allows you to easily add/remove users from the group at any time. See screenshot below...
message.JPG
Also as i have pointed out in the screenshot you can also have message moderation, which means that someone has to approve sending to the group before the message is sent.

You can also use powershell to accomplish this with the reverse. Meaning if you want to allow everyone and block specific people. Run the following command...
Set-DistributionGroup -identity DG1 -RejectMessagesFromSendersOrMembers "bob smith"

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Or a group

Set-DistributionGroup -identity DG1 -RejectMessagesFromSendersOrMembers "group1"

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Will.

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Shweta GoelCommented:
Hi,

For Outlook 2010 and 2013

•      Select Home > Junk >Junk E-mail > Blocked Senders >Add.
•      Enter the name or address which you want to add.
•      Now, click on OK.

Regards
SteveAuthor Commented:
Will, thanks for that comment it was great, now what about the individual email accounts? Can someone still select the sales users individually and email?
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