Exchange forwarding rule only works internally

Hello - we have an Exchange mailbox and want ANY email to an address to be forwarded to a group.  If an INTERNAL email is sent to the address, it works. If the email comes from the OUTSIDE however, it fails.
Damian_GardnerAsked:
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Vaseem MohammedCommented:
Hope these are the steps that you followed to create the Rule.
Step1Step2Step3Step4
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AmitIT ArchitectCommented:
Open mailbox properties and set the forwarding option. Read this
https://technet.microsoft.com/en-us/library/dd351134(v=exchg.160).aspx
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Damian_GardnerAuthor Commented:
Thank you for your responses, Vaseem and Amit.  I neglected to mention that I initially set this up thru the EMC, using a group and the mail flow options on the mailbox.  I have not tried Outlook or the Exchange shell yet.  If I use the shell, can I forward to multiple recipients, or just a single user?

Thank you
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Jeremy WeisingerSenior Network Consultant / EngineerCommented:
If the initial email is sent to a group, by default it only allows receiving from internal users. You need to change it to allow accepting from all users.
https://community.spiceworks.com/how_to/37412-exchange-2010-allow-a-distribution-group-to-receive-external-emails
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AmitIT ArchitectCommented:
I assume you also enable forwarding option at org level. If not, if will fail to send email to external users.
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Damian_GardnerAuthor Commented:
Here is what my EMC forwarding is set to right now (and is failing for externally sourced emails only):


Screen shot of Exchange mailbox forward option
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Amit KumarCommented:
Please check DL I think you have not unchecked one option in DL mail flow properties.

"Require authentication from all senders"

Search DL in Exchange Console --> search DL ---> open Properties --> mail flow setting tab --> message restrictions --- you will be able to see one check box " require authentication ..." uncheck it and then check.
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Vaseem MohammedCommented:
Any emails sent to User1 must be forwarded to a Group.
Email from Internet or Internal.
Using Outlook method: The Owner of User1 mailbox have control. This configuration cannot be done by EMS (Powershell)
Using Mailflow/Delivery Options/Forward give control to Exchange admin, and the user is unknown about whats going on. This can be configured using EMS.
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AmitIT ArchitectCommented:
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Damian_GardnerAuthor Commented:
I'm just seeing Jeremy's comment now - I think this might be the problem.  I will check that...
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Damian_GardnerAuthor Commented:
Ok - you guys are fast :)  I will check all of those - please standby
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Damian_GardnerAuthor Commented:
Unchecking the "Require Authentication from All Users" was the problem. Once I turned that off, the outside email is forwarded thru to the users in the group.  Thanks to Amit for that, and also to everyone else.  I'll close this out and thanks again everyone.

Damian
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Jeremy WeisingerSenior Network Consultant / EngineerCommented:
Thanks to Amit for that
Um... OK, but I was the one that gave you that info....
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Amit KumarCommented:
:) ... Jeremy I owe my points to you.. However happy to help
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Jeremy WeisingerSenior Network Consultant / EngineerCommented:
Sorry, I may have come off a little annoyed. I was really just confused but I see that you also posted that info shortly after. :) No worries.
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