Recently noticed that email server IP address 184.108.40.206 is added to Symantec email blacklist. This IP is clean, not listed at any blacklists. The email server is not open relay, all emails are signed by strong DKIM, also using PRVS, and no spam e-mails. IP has valid PTR (reverse DNS) and SPF records. No suspicious activity - it's clean machine. Have tried several times to ask to remove from Symantec email blacklist at IP Address Investigation Request page - and they removed it - but after 1 day - IP was added again. I heard lots of people complains about this Symantec blacklist.. How to fight them? It is impossible to send emails to several domains now.