Help Plz - How to prevent IPv6 addresses from sending spam?
Today my mail was blocked by google and I received this message:
[Google-IPv6-address] said: 550-5.7.1 [My-IPv6-address 1] Our system has detected an unusual 550-5.7.1 rate of unsolicited mail originating from your IP address. To protect 550-5.7.1 our users from spam, mail sent from your IP address has been blocked. 550-5.7.1 Please visit http://www.google.com/mail/help/bulk_mail.html to review 550 5.7.1 our Bulk Email Senders Guidelines.
Does this mean my system is compromised or is it only my IPv6 being used as spam relay? I am using postfix and my IPv4 is protected by SPF. I have many IPv6 addresses and I don't know if others are also being used to send spam. How do I protect my IPv6? Where should I check for logs, because my mail logs are not showing anything. Why the mail was sent over IPv6 instead of IPv4?
What are the possible solutions?
How to configure postfix to tackle this situation?
Should I use SPF for IPv6? If so, how would I configure it?
Should I just disable all IPv6 addresses? Are there any disadvantages if I turn off IPv6?
Any better solutions?
Any help is greatly appreciated.