Is there a tutorial in order to learn rspamd working with ispconfig ? (because if i modify something in rspamd ...conf , conflicting with ispconfig ... ?)
Go to the rspamd web interface and have a look which rules were triggered. There you can also adjust the specific rules to get less false positives. Of course, best would be to adjust your mails so that they are not recognized as spam ;-)
I can second that what steini posted, havind your send mails trigger the spamfilter means that you either end spam or that something must be configured wrong in your setup or dns of the sender domain, e.g. you disallowed sending for the IP of the sending server in spf or something similar. So your issue is not a false positive problem in Rspamd, ist more likely an incorrect setup or dns settings.
