Hello Swinog, All our customer e-mails to bluewin mails are delayed with "451 4.2.0 sc965: IP reputation ratelimit in effect" until it finally gives up (some of them never get through) We have currently a lot of support tickets and complaints from our customers because of this.
It's the 3rd time it happens in two weeks and we found evidence of unusual SPAM activity from our servers that would justify such a ratelimiting/rejecting. We spend a lot of resources on keeping our servers clean. They aren't listed in any blacklist. The overall reputation is good (senderscore, talos intelligence, abusix....) Also we're far from having the same outgoing volume as would have big players (and common source of spam) like gmail, outlook, etc. and they don't seems to be affected by the same issue when sending to bluewin ?? Could it be there some kind of whitelisting for these senders at bluewin? If yes, can our servers also be whitelisted from this ? Of course, I understand the need to protect servers from SPAM but actually it is also affecting legit senders and causing a lot of trouble. Kind regards, Sébastien RICCIO SYSTEM ADMINISTRATOR P +41 840 888 888 F +41 840 888 000 M sric...@swisscenter.com -----Message d'origine----- De : swinog-boun...@lists.swinog.ch <swinog-boun...@lists.swinog.ch> De la part de Marc SCHAEFER Envoyé : mercredi, 31 mars 2021 14:44 À : swinog@lists.swinog.ch Objet : Re: [swinog] Mail rejection at bluewin On Wed, Mar 31, 2021 at 02:06:24PM +0200, Tobi wrote: > 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. They communicated as follows: "Due to a heavy spam wave before and over the weekend around the 27th of March, Bluewin Mail was forced to temporarily tighten up its policy for large senders. As of today, these rules have been lifted and sending to Bluewin Mail should not lead to rejects or defers anymore. If you still experience issues sending to Bluewin Mail as of today [tuesday], please open up another ticket on our support portal (support.bluewin.ch). " I concur there were more spams last week-end than usual, the catched-up list was about twice as long, and 2 phishing attempts went through on my mail server. _______________________________________________ swinog mailing list swinog@lists.swinog.ch http://lists.swinog.ch/cgi-bin/mailman/listinfo/swinog _______________________________________________ swinog mailing list swinog@lists.swinog.ch http://lists.swinog.ch/cgi-bin/mailman/listinfo/swinog
