How do you check if your domain or IP is listed?

Blocklist checking methods:

Multi-list scanners:

MXToolbox Blacklist Check - scans 100+ lists

HetrixTools - multi-list monitoring

MultiRBL - comprehensive scanning

Direct checks:

spamhaus.org/lookup - Spamhaus lists

barracudacentral.org - Barracuda

surbl.org - URI blocklist

What to check:

All sending IP addresses

Sending domains

Link domains used in emails

Tracking domains

Frequency:

Check regularly (weekly minimum)

Check immediately when problems occur

Set up automated monitoring

Regular inspections of all registries where your fleet might be flagged.