It would help to have a link to Gmail's suggestions. This website tests dkim and spf. http://dkimvalidator.com
Original Message From: tom.brow...@gmail.com Sent: August 29, 2017 4:10 PM To: postfix-users@postfix.org Subject: mitigating gmail spam traps: how does one add the required headers?8 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? Thanks. -Tom