troubleshooting Question

Email to query-based DL is looping

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cyberleo2000Flag for United States of America asked on
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4 Comments1 Solution90 ViewsLast Modified:
I am in the process of migrating from Exchange 2007 to Office 365 \ Exchange Online. I am aware that dynamic distribution lists (DDL) do not sync from on-prem to Office 365 and that the workaround is to create a mail-contact in Office 365 with the smtp address of the on-prem DDL.

To test this I created a DDL as follows:

New-DynamicDistributionGroup -Name "Office365 DDL Test" -Alias "Office365ddltest" -OrganizationalUnit "<MY ORG PATH>/Distribution Lists/Query-based" -RecipientFilter {(RecipientType -eq 'UserMailbox' -or RecipientType -eq 'MailUser') -and (CustomAttribute7 -eq "ICT Messaging")} -RecipientContainer "<MY DOMAIN>"

I then created a mail-contact in Office 365 with the same name and smtp address as the on-prem DDL, Office365DDLTest@MYDOMAIN.com

I set CustomAttribute7 on two the mailboxes as described in the recipient filter above.

When I send an email from my mailbox, which is on Office 365, I get an NDR referencing a loop error:

I've attached the NDR as a text file

Thank you in advance for any assistance you can provide :)
DDL-Loop-NDR.txt
ASKER CERTIFIED SOLUTION
cyberleo2000

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