In one of my servers, some of the mails sent from one user to another are being marked as spam, even if it they are sent through the Web UI.
Local networks are in "trusted networks" option through web interface. I also modified the spamassassin/local.cf file and added them manually (the trusted_networks line was not in there although it is in th salocal.conf.in file) but it did not fix the problem.
Last thing I have done is whitelisting the domain into salocal.conf.in - whitelist from *@domain.com - like Improving Anti-Spam system wiki article suggested. This is to be tested tomorrow during the day.
What could be happening? I have several Zimbra installations and this is the first time I experience something like this. Any ideas?