On 2017-02-14 at 16:28 +0100, Sebastian Wiesinger wrote: > I'm not sure if I'm special if I would like my mails to get delivered > when my server is not doing anything wrong?
Rent on a storefront in a well-policed clean part of town is higher than rent on a back-alley where the streets are being reclaimed by the swamp. There is a reason for this. If your mail-server is sited in a swamp, you will have deliverability issues, no matter how well run that one server is. No matter how cheap the swamp is or how many people are slumming it in shacks there. IP address-space is not all equal, and idealistic attempts to treat it as such keep running into scaling issues of bell-curve populations and human nature. The SYN packets might get through, but much more than that is more open to question. I outright reject connections from address-space in the Spamhaus DROP list; you won't even get an SMTP banner, the firewalls just block that space outright. So not even the SYN gets through. There are shades and degrees of badness. You can be not on the DROP list, but if you're in known dynamic cloud-space then you might be _required_ to use DKIM, to assert a domain identity, because IP reputation in something where an IP change is an API call away is worthless. (I used to have that check, it's currently disabled pending a refactoring of some stuff). And past that, places which allow spam to flow for 48 hours at a time are going to have a strongly negative baseline reputation for the netblock and you're then stuck doing everything you can to try to convince desired recipients that your mail might stand out as different. I can't say it enough, _every_ postmaster needs to read "Sender Reputation in a Large Webmail Service" by Bradley Taylor: https://research.google.com/pubs/author70.html -Phil _______________________________________________ mailop mailing list [email protected] https://chilli.nosignal.org/cgi-bin/mailman/listinfo/mailop
