IP address lists
Spamhaus ZEN, SpamCop, and Barracuda — common DNSBLs mailbox providers consult for sending server reputation.
Blacklist check — verify IP and domain reputation.
See if your sending IP or domain appears on major email blacklists. Pair with the Mail Tester for a full deliverability picture before campaigns.
Which blacklists do we check?
Domain lists
Spamhaus DBL for domains used in email links and headers. Use an IP check for your SMTP server and a domain check for your From domain.