email filtering
A misuse of Spamhaus blocklists: PART 2 – How to limit outbound spam
If you’ve skipped the first part of this series, we strongly recommend you go and read this blog first to understand the misuse of Spamhaus blocklists to block outbound mail. However, if ...
A misuse of Spamhaus blocklists: PART 1 – blocking outbound email
One issue our folks handling tickets submitted by blocked users experience are messages like: Help! My IP is listed by Spamhaus and now I can’t send emails! My provider is rejecting all ...
The Policy Blocklist: what is it, and why should you be on it?
It’s not always "bad" to be listed on one of Spamhaus' DNS Blocklists. Despite what you may think, there is one list you may want to be on: the Policy Blocklist (PBL) ...
How Should Zero Trust Apply to Phishing?
Isolation for Zero Trust Phishing Protection Phishing sites frequently evade web and email filters because of the inability of secure gateways to detect new phishing websites or categorize them properly. According to ...
The URL “Danger Zone”
Inadequate Security Policies with Uncategorized Sites The challenge most email gateways face is how to protect against URL-based threats that exist within a “danger zone”— the period when phishing sites are allowed ...
The Spamhaus PBL, a one year old anti-spam heavyweight
One year ago this month, Spamhaus launched the Policy Block List, also known as the PBL. Now a year later we look back to see what effect it has had. The PBL ...