Keeping your network trusted.
WHY IT MATTERS
Your addresses carry a reputation, and a poor one affects every customer using them.
WHAT DAMAGES IT
Outbound spam Attacks originating from your space Hosting phishing or malware Being listed on blocklists
WHAT TO MONITOR
Blocklist listings, for every address range you operate Outbound mail volume and rejection rates Complaints received
WHAT TO DO ON LISTING
Establish the cause Fix it Request delisting Verify removal
WHAT NOT TO DO
Request delisting without fixing the cause.
WHY
It relists, and your credibility with that operator falls.
WHAT TO SEPARATE
Outbound mail onto dedicated addresses.
WHY
So a problem is contained rather than affecting web traffic or other customers.
WHAT TO CONFIGURE ON EVERY SENDING ADDRESS
Reverse name resolution matching the sending name Authentication records
WHY REVERSE RESOLUTION
Mail from addresses without it is widely rejected.
WHAT TO DO WITH ADDRESSES INHERITED OR REASSIGNED
Check their history before use.
WHY
A previously abused address arrives already listed.
WHAT TO PLAN
How you would recover from a range-wide listing.
