Re: best practices for fighting spam with Debian?
On 2016-12-19 17:31:19 +0000, Joe wrote:
> On Mon, 19 Dec 2016 13:09:22 +0100
> Vincent Lefevre <vincent@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 <vincent@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)
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