On 2016-12-19 17:31:19 +0000, Joe wrote: > On Mon, 19 Dec 2016 13:09:22 +0100 > Vincent Lefevre <vinc...@vinc17.net> wrote: > > > On 2016-12-16 17:58:26 +0000, Joe wrote: > > > This check used to be pretty much a guarantee of a business IP > > > address, but unfortunately many home ISP accounts now have > > > complementary A-PTR records, making spam detection much harder. > > > > Their users may need to send mail after all. > > Which they can do through their email provider, or more likely, through > webmail, without any PTR record at all.
Sometimes, the mail servers of the email provider are blacklisted, mainly due to other customers. > Running a SMTP server on the Net requires a small amount of knowledge > and carries a certain amount of responsibility, which cannot reasonably > be expected of home users. It doesn't need to be an open SMTP server! Note that Debian is generally installed with a SMTP server by default (exim4 is of priority "standard"; and cron, which has priority "important" recommends exim4 | postfix | mail-transport-agent). Anyway, what's important here is that the software provides a sendmail compatible interface. With this interface, both exim and postfix are able to talk to the destination mail server, just like what a smarthost would do. Then, if the user's machine sends spam, this is a problem, whether a smarthost is used or not. -- Vincent Lefèvre <vinc...@vinc17.net> - Web: <https://www.vinc17.net/> 100% accessible validated (X)HTML - Blog: <https://www.vinc17.net/blog/> Work: CR INRIA - computer arithmetic / AriC project (LIP, ENS-Lyon)
