Email authentication · Free, no signup

Will your emails land in spam?

Type your sending domain and check SPF, DKIM and DMARC, the settings that decide whether Gmail and Outlook trust your email.

Email authenticationExample · vivo.com.br

3 issues to fix

vivo.com.br

69/100

spf
SPF needs 18 DNS lookups; the limit is 10, so SPF failsRemove unused includes or flatten some of them.
bimi
No BIMI recordOptional: publish default._bimi with your logo (SVG) so it can show in inboxes.
mta-sts
No MTA-STSOptional: publish MTA-STS to require TLS for mail sent to you.

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Questions

Why does DKIM say none found?

DKIM keys live under a selector name only your email provider knows. We check the common ones; a custom selector can exist without showing here.

Paste a DOI and see the title, authors, year and publisher it really points to.

Type a topic and get published papers with authors, year and a DOI link you can cite.

Type a person, place or idea and get the Wikipedia summary in English, Portuguese or Spanish, with the source link.

Type a ticker and get the latest 10-K, 10-Q or 8-K filings straight from SEC EDGAR, with links.

Type an app name and a country and read its newest App Store reviews, with the average rating.

Name up to three competing apps and see how many recent reviews are 1 or 2 stars, and the word that shows up most in them.