On Tue, 29 Aug 2017, Tom Browder wrote:
Gmail has a list of steps recommended to minimize spam identification,
particularly mail sent as bulk mail (as from mailing lists).
One of the recommendations is to use DKIM and that is clearly explained on the
postfix website.
The other steps are fairly straight forward, also, but how does one add the
various headers they recommend? I assume it's via a filter, but which one and
how is it done?
The recommendations from the Google link you gave usually boils down to:
* use software properly adhering to standards (e.g. for mailinglists) and
configure it properly
* if you send mail with your own software make sure you generate mails
which follow the standards
* check if what you send really is what you want to send
Google is especially unhappy when you send lots of mails (e.g. from a
warning or information system) and don't mark the mails as "bulk". The
PTR, SPF, DKIM setups are very important for them as well if you send bulk
mail and the fact that Google users don't have any of your mails in their
Spam folders. If you get bounces for some users it may be better to inform
and unsubscribe them instead of loosing reputation. They can resubscribe
when they cleanup their Spam folder in case they still want to receive the
mailinglist.
All the other tests also apply:
* What does an own (receiving) SpamAssassin say to your mails
* What do blacklists say
The cleaner a mail is (good time stamps, no bad or strange headers, ...)
the better is the chance bulk mail is accepted.
In the past I can't remember trouble with normal (human sent) mail. Google
makes differences between the human made mail and automatic mail systems
of different sorts. Requirements for mail from the automatics are higher.
Ciao
--
http://www.dstoecker.eu/ (PGP key available)
