Hello all, having a weird issue, hope it's something simple.
I have a 4 groups, all are mail enabled, the primary group let's call Group A, and Groups 1, 2, and 3 are members of Group A.
Group 1 and 2 are universal security groups, group 3 is a universal distribution group.
If I send mail to Group A, and track the message I see:
Expansion: Group 1, Group 2, Group 3
Expansion: (Members of Group 1)
Expansion: (Members of Group 3)
Transfer: Members of groups + it tries to email Group2@domain.com
Fail: Delivering to Group2@domain.com since there's no mailbox.
I cannot understand why it is not expanding that group properly, I have tried removing it and re-adding it, but I am afraid to re-create it entirely since it's been around a few years and may be on some ACL's I don't know about.