is your domain on a blocklist? you might not know until your email stops arriving blocklists (DNSBLS) are maintained by organizations that track IP addresses and domains associated with spam or abuse if your sending IP ends up in one, your deliverability drops... sometimes to zero the problem is there are dozens of blocklists, each with different criteria and different delisting processes you can't check them manually I built the blacklist check tool to query multiple DNSBLS simultaneously for any IP or domain real scenario: a company migrated ESPs and inherited a sending IP that was previously used for spam their email worked fine in testing but failed in production because the IP was listed on Spamhaus and Barracuda a 30-second blocklist check would have caught it before go-live https://dmarcguard.io/tools/blacklist-check/ #DMARC #EmailSecurity #Blocklist #EmailDeliverability
