I'd guess that myprasarana.onmicrosoft.com is compromised (or has
compromised accounts). I've seen this name before, reported the spam, and
put it on our reject list. Don't know whether Microsoft failed to forward
the spam report, or the tenant's admins are simply incompetent.
Cheers,
Hans-Martin
Am 7. September 2022 08:21:33 schrieb ml+mailop--- via mailop
<mailop@mailop.org>:
My system is getting spammed by outbound.protection.outlook.com
mail=<bounces+SRS=77b8F=z...@myprasarana.onmicrosoft.com>
rcpt=<sendmail-bugs-y...@support.sendmail.org>, stat=550
rcpt=<sendmail-faq-y...@support.sendmail.org>, stat=550
and this happens again and again.
(note: it happened before with other MAIL addresses)
It their MTA broken -- ignoring 550 for RCPT?
Or is the sender submitting the mail again and again?
the latter seems unlikely based on the logs:
Sep 6 22:18:13 mail=<bounces+SRS=77b8F=z...@myprasarana.onmicrosoft.com>
Sep 6 22:19:16 mail=<bounces+SRS=77b8F=z...@myprasarana.onmicrosoft.com>
Sep 6 22:20:19 mail=<bounces+SRS=77b8F=z...@myprasarana.onmicrosoft.com>
Sep 6 22:21:21 mail=<bounces+SRS=77b8F=z...@myprasarana.onmicrosoft.com>
Sep 6 22:22:24 mail=<bounces+SRS=77b8F=z...@myprasarana.onmicrosoft.com>
Sep 6 22:27:26 mail=<bounces+SRS=77b8F=z...@myprasarana.onmicrosoft.com>
Sep 6 22:32:28 mail=<bounces+SRS=77b8F=z...@myprasarana.onmicrosoft.com>
Sep 6 22:37:31 mail=<bounces+SRS=77b8F=z...@myprasarana.onmicrosoft.com>
Sep 6 22:42:33 mail=<bounces+SRS=77b8F=z...@myprasarana.onmicrosoft.com>
Sep 6 22:47:36 mail=<bounces+SRS=77b8F=z...@myprasarana.onmicrosoft.com>
Sep 6 22:52:39 mail=<bounces+SRS=77b8F=z...@myprasarana.onmicrosoft.com>
Sep 6 23:02:42 mail=<bounces+SRS=77b8F=z...@myprasarana.onmicrosoft.com>
Sep 6 23:12:45 mail=<bounces+SRS=77b8F=z...@myprasarana.onmicrosoft.com>
Sep 6 23:22:49 mail=<bounces+SRS=77b8F=z...@myprasarana.onmicrosoft.com>
Sep 6 23:32:53 mail=<bounces+SRS=77b8F=z...@myprasarana.onmicrosoft.com>
Sep 6 23:42:57 mail=<bounces+SRS=77b8F=z...@myprasarana.onmicrosoft.com>
Sep 6 23:53:01 mail=<bounces+SRS=77b8F=z...@myprasarana.onmicrosoft.com>
Sep 7 00:03:05 mail=<bounces+SRS=77b8F=z...@myprasarana.onmicrosoft.com>
Sep 7 00:13:09 mail=<bounces+SRS=77b8F=z...@myprasarana.onmicrosoft.com>
Sep 7 00:23:12 mail=<bounces+SRS=77b8F=z...@myprasarana.onmicrosoft.com>
Sep 7 00:33:15 mail=<bounces+SRS=77b8F=z...@myprasarana.onmicrosoft.com>
Sep 7 00:43:18 mail=<bounces+SRS=77b8F=z...@myprasarana.onmicrosoft.com>
Sep 7 00:53:22 mail=<bounces+SRS=77b8F=z...@myprasarana.onmicrosoft.com>
Sep 7 01:03:26 mail=<bounces+SRS=77b8F=z...@myprasarana.onmicrosoft.com>
Sep 7 01:13:30 mail=<bounces+SRS=77b8F=z...@myprasarana.onmicrosoft.com>
Sep 7 01:23:34 mail=<bounces+SRS=77b8F=z...@myprasarana.onmicrosoft.com>
Sep 7 01:33:37 mail=<bounces+SRS=77b8F=z...@myprasarana.onmicrosoft.com>
Sep 7 01:43:40 mail=<bounces+SRS=77b8F=z...@myprasarana.onmicrosoft.com>
Sep 7 01:53:44 mail=<bounces+SRS=77b8F=z...@myprasarana.onmicrosoft.com>
Sep 7 02:03:47 mail=<bounces+SRS=77b8F=z...@myprasarana.onmicrosoft.com>
Sep 7 02:13:51 mail=<bounces+SRS=77b8F=z...@myprasarana.onmicrosoft.com>
Sep 7 02:23:54 mail=<bounces+SRS=77b8F=z...@myprasarana.onmicrosoft.com>
Sep 7 02:33:57 mail=<bounces+SRS=77b8F=z...@myprasarana.onmicrosoft.com>
Sep 7 02:44:01 mail=<bounces+SRS=77b8F=z...@myprasarana.onmicrosoft.com>
Sep 7 02:54:05 mail=<bounces+SRS=77b8F=z...@myprasarana.onmicrosoft.com>
Sep 7 03:04:09 mail=<bounces+SRS=77b8F=z...@myprasarana.onmicrosoft.com>
Sep 7 03:14:12 mail=<bounces+SRS=77b8F=z...@myprasarana.onmicrosoft.com>
Sep 7 03:24:17 mail=<bounces+SRS=77b8F=z...@myprasarana.onmicrosoft.com>
Sep 7 03:34:21 mail=<bounces+SRS=77b8F=z...@myprasarana.onmicrosoft.com>
Sep 7 03:44:25 mail=<bounces+SRS=77b8F=z...@myprasarana.onmicrosoft.com>
Sep 7 03:54:29 mail=<bounces+SRS=77b8F=z...@myprasarana.onmicrosoft.com>
Sep 7 04:04:32 mail=<bounces+SRS=77b8F=z...@myprasarana.onmicrosoft.com>
Sep 7 04:14:35 mail=<bounces+SRS=77b8F=z...@myprasarana.onmicrosoft.com>
Sep 7 04:24:39 mail=<bounces+SRS=77b8F=z...@myprasarana.onmicrosoft.com>
Sep 7 04:34:42 mail=<bounces+SRS=77b8F=z...@myprasarana.onmicrosoft.com>
Sep 7 04:44:45 mail=<bounces+SRS=77b8F=z...@myprasarana.onmicrosoft.com>
Sep 7 04:54:49 mail=<bounces+SRS=77b8F=z...@myprasarana.onmicrosoft.com>
Sep 7 05:04:54 mail=<bounces+SRS=77b8F=z...@myprasarana.onmicrosoft.com>
Sep 7 05:14:58 mail=<bounces+SRS=77b8F=z...@myprasarana.onmicrosoft.com>
Sep 7 05:25:02 mail=<bounces+SRS=77b8F=z...@myprasarana.onmicrosoft.com>
Sep 7 05:35:05 mail=<bounces+SRS=77b8F=z...@myprasarana.onmicrosoft.com>
Sep 7 05:45:09 mail=<bounces+SRS=77b8F=z...@myprasarana.onmicrosoft.com>
Sep 7 05:55:13 mail=<bounces+SRS=77b8F=z...@myprasarana.onmicrosoft.com>
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