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DNS Watch

dnswatch.info

DNSWatch offers DNS lookup and reverse DNS lookup tools with exact performance measuring and DNS server monitoring. It also provides RBL email blacklist lookup and IP location lookup. Paid products include DNS performance monitoring starting at $1 per month, mailserver blacklist monitoring starting at $3.5 per month, and a DNS changetracker starting at $7.9 per month. The site is free to use with ads.

Email Dossier

centralops.net

Email Dossier is a validation tool that checks an email address by walking through the process of sending email without actually sending any. It checks address syntax, looks up the domain's mail servers and tries contacting them. It reports a confidence rating from 0 to 3, error codes, a canonical address and MX records.