Hello. What do you think about mail-tester.com . Should I (we) take the feedback over there in consideration?
mail-tester.com is good! its a way to quickly test the quality of our own newsletters. Checks Domain/IP black list, Authorization(SPF,DKIM..etc) and check your email against SpamAssassin.. it can give a pretty good idea on how's your emails. and remember all spam filters work differently. What may pass in mail-tester, might not in your own office inbox.
its good. you have to check why your DKIM is not working right! other then that everything looks good. keep in mind that ISP have different filter so a score of 10/10 does not guarantee the inbox, but its a good sign that you are a legit sender.