| Domain | Date |
| mx7.kosu.org | 2025-07-15 |
| post.kosu.org | 2025-07-13 |
| smtp.comune.kosu.org | 2025-07-12 |
| comune.kosu.org | 2025-06-10 |
| email.kosu.org | 2025-06-10 |
| kosu.org | 2025-06-10 |
| relay2.kosu.org | 2025-06-10 |
| mail1.kosu.org | 2025-06-09 |
| mail7.kosu.org | 2025-06-09 |
| www.kosu.org | 2025-05-12 |
| poczta.kosu.org | 2025-04-28 |
| postmaster.kosu.org | 2025-04-28 |
| exchange.kosu.org | 2025-04-26 |
| mailhost.kosu.org | 2025-04-17 |
| mailin.kosu.org | 2025-02-03 |
| mail.comune.kosu.org | 2024-09-24 |
| ytk.fi | 2023-10-19 |
| analytics.ytk.fi | 2023-08-31 |
| www.ytk.fi | 2023-08-29 |