My ip 188.8.131.52 listed in Symantec Global Bad Sender.
I am use https://ipremoval.sms.symantec.com/ and removed. the next day again and agai and again… … …
My email server mail.twickel.hu not send spam, no hacking activity, everything is perfect.
Use SPF, DKIM and DMARC record. Working perfectly.
My rbl, sbl … hasn’t been on the list for two years. I check daily.
My server not open relay.
My ip fix and reverse dns mail.twickel.hu.
My certificate OK. A+ in all security control systems, for example:
My sender score 100/100.
I have no problem with any other system except symantech.
Please see why the perfect server is blacklisted.