Free Tools
The diagnostic tools we use ourselves. Free, no signup, no email gate.
Email Verifier
Check whether an email is real and deliverable. Syntax, MX, and mailbox-level probe. Useful before importing any list.
Open ToolDNS/SMTP Health Checker
Check SPF, DKIM, DMARC, MX records, and SMTP connectivity for any domain. One scan, full report.
Open ToolMX Lookup
Look up a domain's MX records and identify the mail provider behind any address.
Open ToolWarmupLab
Automated warmup for new sending IPs and domains. Engagement-based, ramps gradually, monitors per-ISP. Coming soon.
Stay TunedBuilt by us, used by us
Same tools we run before deploying any of our own SMTP infrastructure. Free because there's no reason to charge for them.