Blocklist recovery sequence:
- Identify which list(s) via MXToolbox
- Find root cause (compromised server, spam traps, purchased lists)
- Fix the issue before requesting removal
- Submit delisting through each list's process
- Monitor for re-listing
Delisting timelines:
- SpamCop: Auto-delists 24-48 hours after reports stop
- Spamhaus XBL/CSS: Minutes via self-service
- Spamhaus SBL: Requires ISP abuse team — hours to weeks
Debugging authentication:
- SPF fails: Too many lookups, missing includes, multiple records
- DKIM fails: Selector mismatch, body modified, key < 1024 bits
- DMARC fails: Both SPF and DKIM domains fail to align with From
- Fix: Configure custom Return-Path and DKIM signing domains via ESP
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