Exchange D-List not working

Hi All,

I recently setup a second email domain.

This seems to work well, as i can send I can add email addresses for the new email domain to existing users and they recieve emails.

However I setup a distribution group and it bounces emails with the following NDR

Remote host said: 550 5.1.1 User unknown [RCPT_TO]


any suggestions?
LVL 2
detox1978Asked:
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detox1978Author Commented:
NRhode,

there's quite a few suggestions on that link.  Which did you have in mind?
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Nick RhodeIT DirectorCommented:
Depends on if you have an edge server or not.  Since you just created it I would try restarting the transport service.  Are the other distribution groups working fine?  Or only ones newly created?
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Lior KarasentiCommented:
Try to untick the "requires that all senders are authenticated" from the group properties ->mail flow settings-> message delivery restrictions
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Nick RhodeIT DirectorCommented:
Doing the above will allow public to email that group if thats what your aiming for.
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Seth SimmonsSr. Systems AdministratorCommented:
ndr would state 5.7.1 authentication required, not user unknown
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detox1978Author Commented:
I run this command

Get-DistributionGroup | Set-DistributionGroup -RequireSenderAuthenticationEnabled:$false

Which I think unticks the "requires that all senders are authenticated", as it's not ticked and emails are now arriving inbound.


However, when a user sends an email using the from cached address they get the following NDR

You can't send a message on behalf of this user unless you have permission to do so. Please make sure you're sending on behalf of the correct sender, or request the necessary permission. If the problem continues, please contact your helpdesk.


They have Send As permission and if they explicitly pick the d-list form "other email address" it works.

Any idea why the cache has stopped working?


alternatively, is there a way to have the reply address always be the same as the recipient address?


many thanks
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Nick RhodeIT DirectorCommented:
Could be referencing a previous address much like recreating a mailbox.  So what you would do is delete that cached address.  You can either remove the suggested contact (outlook 2010) or highlight the address when autocompete pops up and hit delete key or the X.
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detox1978Author Commented:
If it delete it and pick it from the "other email addresses" it works 100% of the time, if I then try and use the cached version it fails 100% of the time.

I've tried it fives times.

I'm testing it using Outlook Anywhere on a PC not on the domain, so the credentials are stored in the outlook profile.
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Nick RhodeIT DirectorCommented:
So the newly created cached contact fails after following my last post?
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detox1978Author Commented:
Yes that correct.


I can only send when I manually from via other email address.

Note, my PC isn't on the domain and is connecting via Outlook Anywhere.
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