We have a Dynamic Distribution Group for all Company that gathers about 11.000 mailboxes, and normally it’s used for Global email. Recently we have been receiving a lot of complaints from people about not receiving the emails from a determined Address. The address sending the email to the DDG has a limit of 30.000 recipients and it always worked fine.
Checked Outlook and OWA for some users for any rule blocking the email receiving and there are no rules affecting that and shouldn’t be no rules because people were receiving the email and it stopped in June.
Already tracked the emails on Exchange Message Tracker and there are no fails, ran a command in Exchange Shell to get all users “caught” by the DDG and even the ones that don’t receive the emails are there.
Thanks.