We're seeing the same issue since 28th March. Looks like their new reputation system needs some fine tuning by a big hammer :-) Maybe they bought the same reputation system as 1&1 did not long ago.
451 4.2.0 sc965: IP reputation ratelimit in effect
On 3/28/21 4:16 PM, Silvan M. Gebhardt wrote:
Yup, seen the same!
with a shared hosting server which is not on a blacklist at all.
Silvan
----- Ursprüngliche Mail ----- Von: "Peter Rohrer" Peter.Rohrer@gmx.ch An: "swinog" swinog@lists.swinog.ch Gesendet: Sonntag, 28. März 2021 08:40:41 Betreff: [swinog] Mail rejection at bluewin
Hello everybody
Since yesterday, we see a lot of bounced messages to bluewin addresses with SMTP code 554, for example: relay=mxbw-bluewin-ch.hdb-cs04.ellb.ch[195.186.227.50]:25, delay=0.16, delays=0/0.01/0.09/0.05, dsn=5.2.0, status=bounced (host mxbw-bluewin-ch.hdb-cs04.ellb.ch[195.186.227.50] said: 554 5.2.0 sc976: Rejected due to policy reasons - https://support.bluewin.ch/provider/bounce/XXXXXXXXXXXXXXXXX%5Bredacted%5D== (in reply to end of DATA command)) Unfortunately, sc976 is not documented on https://postmaster.bluewin.ch/content/de/technical-details/ We can't see any general pattern behind those rejections (hosts trough our entire IP range are affected), switching to a different IP address for delivery works in most cases.
Do you see the same and have any insight what is going on here?
Greetings Peter
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