Reputation Check

Answers the two panic questions "Why aren't my emails arriving?" and "Why does Chrome warn about my site?": the IPs of your web and mail servers are checked against the major DNS blacklists, the domain itself against domain blocklists and optionally against Google Safe Browsing.

Check	What is checked
Web server IP blacklists	The domain's A/AAAA IPs against Spamhaus ZEN, Barracuda and SpamCop. Spamhaus hits are classified: SBL (spam source) and XBL (compromised host) are critical, PBL (end-user IP range) is only a notice.
Mail server IP blacklists	The IPs of the MX hosts (up to 3, by priority) against the same lists. A listing here is the most common cause of undelivered mail.
Domain blocklists	The domain against Spamhaus DBL and SURBL — with categorization: spam, phishing, malware, botnet C&C or "abused legitimate domain" (your site was hacked).
Google Safe Browsing	Google's threat lists (malware, phishing, unwanted software) — feed the red warning pages in Chrome, Firefox and Safari.

Honest answers instead of false green

Blocklist operators block queries via certain resolvers. Before each run Vernax uses a test entry to check whether each list responds at all. Lists that can't be queried are reported as "not checkable" and don't count toward the score — instead of falsely claiming "not listed".

On a listing

Fix the cause first, then request delisting — otherwise the IP/domain immediately lands back on the list. The check's explain mode contains a step-by-step guide with all delisting contact points.