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.