On Thu, Feb 4, 2016 at 9:13 AM, Andreas Schamanek <scham...@fam.tuwien.ac.at > wrote:
> > On Thu, 4 Feb 2016, at 08:19, Franck Martin wrote: > > > Have you considered that may be it is not postfix sending these > > emails from your IP? > > Yes, of course. This particular server is not even generating enough > traffic according to the firewall to qualify as bulk sender. Besides, > if there was any considerable mail traffic I don't know of its IP > address would have been blacklisted sooner or later. > > On Thu, 4 Feb 2016, at 17:53, Petar Bogdanovic wrote: > > > Maybe your ASN is as filthy as the one surrounding my MTA (Hetzner). > > Gmail seems to score ASNs and rate-limit whole ranges no matter what > > your MTA does in particular. > > That's what I think is the case, indeed. Hetzner is the provider. > It is a netblock quota you're hitting, yes. As we see more and larger hit and run spam jobs from previously unknown or low volume IPs and netblocks, the low volume senders are caught in the cross fire. I'll ping the spam team about the messaging again, saying IP is definitely wrong there. And I can ping them about better handling about this, they've made some improvements recently, but it's a hard problem. Also, the bulk sender guidelines don't only apply to bulk senders, in particular, you have no authentication for your messages. Some of the messages from that server we're treating as authenticated because of our best guess for SPF, but that's not really sustainable. > > gsmtp is still very suspicious of my submissions but at least they > > don't cut me off for *days* anymore. > > Gmail is not just cutting _us_ off. They are cutting themselves off! > It's also their customers who do not receive (in my case) mostly > individual messages which are often even expected in advance (like > people asking for a document via SMS, and then they have to wait hours > until it arrives at Gmail). Spam fighting is a tradeoff between false positives and false negatives. Brandon
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