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I found a issue for hMailserver mail group function. I think this may be a bug.
This issue is reproduced in the following way.
1. Create a mailgroup. ex) Group name: firstname.lastname@example.org Member: email@example.com
2. Open the properties of the e-mail group.
3. Click "Save" button.
When you do the steps above, first action of the Mail Group Rule will change from "Forward email" to "Delete e-mail". So, all email will not reach anyone of its members.
Are there anyone with the same issue?
In addition, I use WSP 1.2 and hmailserver 5.3.3