Hi. Server is created based on Ispconfig3 Perfect Server for Ubuntu 16.04 LTS. There is postfix/dovecot. I found out that Thunderbird does not mark emails as ***SPAM*** in subject line but the server does it. Anybody knows how to deal with it? Some mails are valuable for me. I found SpamAssasin conf file /etc/mail/spamassassin/local.cf on the server but there are only commented out lines: Code: # Add *****SPAM***** to the Subject header of spam e-mails # # rewrite_header Subject *****SPAM***** PS Maybe I should add this domain marked as spam to whitelist in ISPconfig3? Btw I use ESET antivirus software.