smtp server tester

Warning: inverse host lookup failed for 52.97.189.98: Unknown host
Warning: inverse host lookup failed for 52.98.179.98: Unknown host
Warning: inverse host lookup failed for 40.99.149.130: Unknown host
FRA-efz.ms-acdc.office.com [52.97.189.98] 25 (smtp) open
220 FR2P281CA0026.outlook.office365.com Microsoft ESMTP MAIL Service ready at Sun, 28 Jun 2026 10:39:18 +0000 [08DED3DEFE17F14D]