My IP/domain is blocklisted, what's the first step?

Blocklist response process:

Step 1: Identify the listing

Which blocklist? (Spamhaus, Barracuda, SURBL, etc.)

IP listing, domain listing, or both?

When were you listed?

Step 2: Understand the reason

Check blocklist lookup for listing reason

Review evidence or incident reference

Often points to specific abuse type

Step 3: Stop the cause

Identify and stop the problematic sending

Fix authentication if that is the issue

Address list quality problems

Step 4: Document fixes

Gather evidence of remediation

Prepare for delisting request

Do not request removal until the cause is fixed.

Identify the violation, fix it, then appeal. Appealing without fixing will fail.