Free tools for email checks, DNS lookups, and deliverability diagnostics
Explore the first ten NexMailPro free tools, from the Email Validator to MX, SPF, DMARC, DKIM, TXT, A, AAAA, and NS lookups. Start with manual checks, then move into API and SDK workflows when your team is ready.
Email Validator
Verify one email address with NexMailPro validation logic, including syntax, domain, MX, and deliverability-oriented signals.
Validation depth
Syntax + MX + risk
Workflow
Existing NexMailPro flow
Email Syntax Checker
Check whether an email address is formatted correctly before you pass it into signup forms, CRMs, or validation workflows.
Lookup type
Format only
Best for
Forms and QA
MX Record Lookup
Lookup MX records for a domain and confirm whether mail routing appears to be configured.
Source
Existing MX resolution path
Output
Targets + priority
SPF Record Checker
Find and review SPF records for a domain so you can inspect sender authorization settings.
Lookup type
TXT / SPF
Best for
Authentication audits
DMARC Record Checker
Lookup a DMARC record and inspect the published policy, reporting addresses, and enforcement mode.
Lookup host
_dmarc.domain
Best for
Policy reviews
DKIM Record Lookup
Lookup a DKIM TXT record by domain and selector to confirm whether signing keys are published.
Lookup host
selector._domainkey
Best for
Outbound auth setup
TXT Record Lookup
List TXT records for a domain so you can review verification, authentication, or provider metadata.
Lookup type
TXT
Best for
DNS audits
A Record Lookup
Lookup IPv4 A records for a domain and review which IPs are currently published.
Lookup type
A / IPv4
Best for
DNS diagnostics
AAAA Record Lookup
Lookup IPv6 AAAA records for a domain and review any published IPv6 destinations.
Lookup type
AAAA / IPv6
Best for
Modern DNS checks
NS Record Lookup
Lookup the authoritative name servers for a domain so you can confirm DNS delegation.
Lookup type
NS
Best for
Delegation checks
Build Next
Move from manual lookups into production integrations
Use the free tools for quick checks, then connect NexMailPro through the REST API, JavaScript SDK, PHP SDK, Laravel package, or WordPress plugin for repeatable validation workflows.
API Docs
Authentication, endpoints, and request examples for NexMailPro integrations.
JavaScript SDK
Use the official npm package from browser and Node.js applications.
PHP SDK
Install the official Composer package for backend workflows.
Laravel Package
Use the first-party Laravel integration with config and validation helpers.
WordPress Plugin
Connect form validation workflows inside WordPress and WooCommerce.