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3 lists need a look. Mail to an empty list reaches nobody, a list without an owner (or owned only by people whose sign-in is blocked) has nobody keeping its members right, and a big list anyone outside can mail is a phishing target. Give each list an owner who still works here, and delete lists nobody uses (Exchange admin centre, Recipients > Groups > Distribution list). To stop outside mail, open the list's Settings and untick "Allow people outside of my organisation to send to this group".
| List | Why | Members | Owners | Last mail received |
|---|---|---|---|---|
| Christmas party 2023 medium | No owner, No mail in 90 days | 9 | None | 25 May 2026 |
| Old projects medium | No members, No owner, No mail in 90 days | 0 | None | 7 Sep 2025 |
| Sales team medium | Only leavers own it | 6 | bobby.marsh@contoso.example | 12 Oct 2026 |
| Christmas party 2023 medium | No owner, No mail in 90 days | 9 | None | 25 May 2026 |
| Old projects medium | No members, No owner, No mail in 90 days | 0 | None | 7 Sep 2025 |
| Sales team medium | Only leavers own it | 6 | ben.okafor@fabrikam.example | 12 Oct 2026 |
| Christmas party 2023 medium | No owner, No mail in 90 days | 9 | None | 25 May 2026 |
| Old projects medium | No members, No owner, No mail in 90 days | 0 | None | 7 Sep 2025 |
| Sales team medium | Only leavers own it | 6 | robert.hughes@ | 11 Oct 2026 |
Built from each client's latest collection with the same report as the client's own page. Select a client's name to open its report.