Check your domain's email authentication, inspect mail servers and measure list health. Every tool is free and needs no account.
Validate a domain's SPF record, its syntax and the 10 DNS lookup limit.
DNS & authenticationLook up a domain's DMARC policy, reporting addresses and common mistakes.
DNS & authenticationBuild a valid DMARC record step by step and copy it into your DNS.
DNS & authenticationSee which mail servers receive email for a domain and who hosts them.
CalculatorsCalculate your bounce rate and see how it compares to safe benchmarks.
Getting email into the inbox depends on three things: proving the mail is really from you (SPF, DKIM and DMARC), sending to servers that accept it (MX records), and keeping bounces low by mailing only real addresses. These tools cover the first two and help you measure the third.
When your bounce rate is the problem, the fix is list verification. InboxSure checks each address with syntax, MX and SMTP mailbox checks and flags catch-all, role-based and disposable addresses.
InboxSure checks every address with syntax, MX and SMTP mailbox checks, and flags catch-all, role-based and disposable addresses. Free to start.