Incoming Spam Plesk
Reduce incoming spam
To help reduce the amount of spam that you receive, you should do the following in Plesk 12+.
- Click on Tools & Settings, then choose Mail Server Settings.
- Enable "Switch on SPF spam protection".
- In the SPF checking mode section, select "Reject mail when SPF resolves to "fail" (deny)
- Enable "Switch on spam protection based on DNS blackhole lists"
- In the DNS zones for DNSBL service field, enter the following:
zen.spamhaus.org;b.barracudacentral.org