Since you absolutely have to run everything you plan on sending to a mailing list via spamassassin beforehand, mail-tester.com is a great tool. It saves the annoying work of cobbling together a spamassassin test script and integrating it into your workflow, and gives you a bunch of other checks while you're at it.
Spamassassin is half of the bane of my life when it comes to maintaining deliverability on a scientific mailing list:
It stops being a useful tool and starts being a mode of censorship that is in effect controlled by the people who practice fraud and abuse. It is very annoying to find all sorts of things that effectively can't be discussed by mail in a list: specific drugs and technical terms used in research, any research discussion or published research that uses long technical words in close proximity, fundraising for research, and so on and so forth. Every newsletter to the opt-in, well-gardened list becomes a little minefield of self-censorship as you go through multiple iterations with spamassassin, weeding out and rewording things.
It is all very trying. One has to think that there's a better way.
Spamassassin is half of the bane of my life when it comes to maintaining deliverability on a scientific mailing list:
https://www.exratione.com/2015/08/spamassassin-is-an-inadequ...
It stops being a useful tool and starts being a mode of censorship that is in effect controlled by the people who practice fraud and abuse. It is very annoying to find all sorts of things that effectively can't be discussed by mail in a list: specific drugs and technical terms used in research, any research discussion or published research that uses long technical words in close proximity, fundraising for research, and so on and so forth. Every newsletter to the opt-in, well-gardened list becomes a little minefield of self-censorship as you go through multiple iterations with spamassassin, weeding out and rewording things.
It is all very trying. One has to think that there's a better way.