* Richard Bradfield: > It appears that since the migration (or whatever happened on the list > over the weekend), the List-Id header is also being stripped from > outbound mail. The last GCC mail I have where the header is intact was > from Friday 6th.
There weren't any List-Id headers before the migration. If you previously filtered on Sender: headers, you have to change your filters. Other filters (List-Post:, for example) may keep working unchanged, but details will be vary according to how you set up your filters.
