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We have a requirement to prevent a single email from being sent to more than one of a known list of domains. We basically want to prevent a user from accidentally emailing 2 clients in the same email. These are a known list of domains.

Is this possible in Exchange 2016 or is there a third party offering which may have this functionality?

thanks

Duncan
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Can you specify the email? For example is there some special content in it? Is that a special domain? If yes you could do the following:

  1. Try to build a transport New-TransportRule
  2. Try to use Mailflow rules
  3. Try to use the DLP Features in Exchange 2016
  4. use a 3rd party product e.g. CodeTwo Exchange Rules Pro
BastianW
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  • Not an answer, OP is looking to allow email to example.com or example.org but not example.com and example.org – Jacob Evans Oct 13 '17 at 11:22
  • And why shouldn’t that a answer? If it’s a domain he could build a group, throw those users into the group, build a restriction and prevent the members from the group to send to these users/domains? – BastianW Oct 13 '17 at 12:03
  • I know the list of domains (basically our clients) and it is for all emails. No user on our domain should be able to email any 2 clients in the same email. – Duncan Oct 16 '17 at 13:47