How to separate risky and safe sending domains fast?

Rapid sending isolation:

Identify affected assets:

Check each domain in postmaster tools

Check each IP on blocklists

Review bounce patterns by sending source

Categorize:

Affected: Poor reputation, blocklisted, high bounce/complaint

Safe: Good reputation, clean blocklist status, normal metrics

Reroute critical traffic:

Move transactional to safe infrastructure

Update DNS/authentication as needed

Test before full migration

Isolate affected:

Stop or limit sending from affected sources

Prevent contamination of safe assets

Speed matters. Move critical traffic before problems spread.

Quarantine damaged ships. Route essential cargo through healthy vessels.