Hi - I've got a small mail server (~50 users) and our Postfix (3.6.4)
config is pretty old and confusing, and may not be doing things we want. So
I'd like to re-jig it. Here's how I think I'd like to have it:

1. Incoming mail (not from $mynetworks or sasl auth): RBL, SPF/DKIM
verification and SA (and maybe DMARC as not doing so currently).

2. Mail originating from $mynetworks and also from sasl-auth clients: DKIM
signing, SA, Rate/IP limiting (and maybe RBL checks? Not sure).

I think I can do that by having all our "global" settings in main.cf

https://pastebin.com/VKfNW0hu

and then specifying various extra bits and overrides in master.cf:

https://pastebin.com/Qcpt29PV

BTW I'm using a script (policyd.pl) that does weighted scoring for RBLs (as
well as SPF), which I'd prefer rather than doing that with Postfix directly.

I've put a couple of questions in as comments in the configs - any
thoughts/suggestions very much appreciated! :-)

Jonathan
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