A free email deliverability checker that reads your domain's email setup the way Gmail, Yahoo and Outlook do, and says what to fix.
5.0(1 rating)Type your domain or email address. See your SPF, DKIM, DMARC, BIMI and MX records the way receiving servers read them, what Gmail, Yahoo and Outlook require of you, and what to fix.
Your domain
DNS is read from your browser. navid.me fetches only the MTA-STS policy, the BIMI files and the domain's age. Nothing is stored.
This free email deliverability checker reads your domain's email setup the way receiving servers do: SPF with every DNS lookup counted, DKIM keys and their size, DMARC and where its reports go, BIMI, MX and MTA-STS.
Then it shows what Gmail, Yahoo and Outlook require of you, rule by rule, from their own pages, and what to fix.
Here's what each record does, what the big mailbox providers require, and what no checker can see.
What is an email deliverability checker?
An email deliverability checker looks up the DNS records that tell receiving servers whether an email really comes from you, and checks them against the rules mailbox providers set.
What Gmail, Yahoo and Outlook require
Since February 2024, Gmail and Yahoo require every sender to authenticate with SPF or DKIM and keep spam complaints under 0.3%. Bulk senders need more:
- Gmail
- Every sender
- Yahoo
- Every sender
- Outlook.com
- –
- Gmail
- 5,000+ a day
- Yahoo
- Bulk senders
- Outlook.com
- 5,000+ a day
- Gmail
- 5,000+ a day
- Yahoo
- Bulk senders
- Outlook.com
- 5,000+ a day
- Gmail
- 5,000+ a day
- Yahoo
- Bulk senders
- Outlook.com
- 5,000+ a day
- Gmail
- Every sender
- Yahoo
- Every sender
- Outlook.com
- –
- Gmail
- Every sender
- Yahoo
- –
- Outlook.com
- –
- Gmail
- 5,000+ a day
- Yahoo
- Bulk senders
- Outlook.com
- –
- Gmail
- Every sender
- Yahoo
- Every sender
- Outlook.com
- –
Since May 5, 2025, Outlook.com rejects email from domains sending over 5,000 a day that miss its rules, with the error "550; 5.7.515 Access denied". Yahoo doesn't give a number for bulk.
The records the checker reads
SPF lists the servers allowed to send as your domain. It fails outright past 10 DNS lookups, or past 2 lookups that find nothing, so the checker counts every include, including the ones inside them. On September 27, 2026, Google's include cost 1 lookup, while Mailgun's and iCloud's cost 5 each.
DKIM signs each email with a key published in your DNS. DNS can't list keys, so the checker tries the selectors services use, like google, k2 (Mailchimp), s1 (SendGrid) and cka (Kit), plus any you type.
DMARC tells receivers what to do when SPF and DKIM fail, and where to send reports. Reports sent to an inbox on another domain only arrive if that domain publishes a record accepting them, which the checker looks up.
BIMI puts your logo next to your emails. Gmail and Apple Mail need a certificate for it, and Yahoo doesn't.
MX records name the servers that take your email, where replies and bounces go.
MTA-STS makes sending servers refuse to deliver your email without encryption. It's optional.
If you send from your own app
Developers send through an email API instead of an email platform:  Amazon SES,  SendGrid or  Resend.
Each one has you verify your domain, which adds its DKIM records, and a bounce subdomain on your domain, so SPF passes for your domain too. Check both here once they're in.
What the checker can't see
A domain check reads what you publish. Whether a real email passes, which server sent it and its unsubscribe headers are in the email itself: paste one into the email header analyzer to fill in the question marks.
Your spam rate is only in each provider's own dashboard, like Google Postmaster Tools. And the habits below decide where your email lands as much as any record.
Habits that keep you out of spam
Each of these comes from Gmail's or Yahoo's own sender rules:
- Use double opt-in, so typos and bots never reach your list
- Make unsubscribing 1 click, with a visible link in every email
- Keep spam complaints under 0.3%, and under 0.1% if you can
- Remove addresses that bounce, with the email list cleaner
- Never buy a list
- Send what people signed up for, as often as you promised
The checker shows them under your results, each with its source.
Final thoughts on email deliverability
Start with the records: SPF with room under 10 lookups, DKIM for every service that sends for you, and DMARC with reports going to an inbox you read.
Then read the reports with the DMARC report analyzer, and move your policy to quarantine once only your own services show up.
The records get you through the door. What you send, and to whom, keeps you there.
Ready to send?
Email platforms that set up SPF, DKIM and DMARC with you
For developers: send from your own app
Where your domain and inbox live
Email Deliverability Checker FAQs
Questions about email deliverability? Here's what to know.
An email deliverability checker looks up your domain's SPF, DKIM, DMARC and other email records, and checks them against the rules Gmail, Yahoo and Outlook set.
Since February 2024, every sender needs SPF or DKIM, reverse DNS for the sending server, and a spam rate under 0.3%.
Bulk senders also need SPF and DKIM, a DMARC record, a From domain that aligns, and one-click unsubscribe.
An SPF record can trigger at most 10 DNS lookups, counting the includes inside includes.
Past 10, SPF fails for every email you send.
DKIM keys can only be looked up by their selector name, and some services use names no checker can guess.
Paste one of your emails into the email header analyzer: its DKIM-Signature shows the real selector.
Gmail, Yahoo and Outlook accept a DMARC record with p=none.
It protects nothing, though: failing email is delivered as usual.
Gmail shows a BIMI logo only with a VMC or CMC certificate and a DMARC policy of quarantine or reject, at 100%.
Yahoo shows logos without a certificate.
Yes, the email deliverability checker is free, with no sign-up.
DNS is read from your browser, and nothing is stored.
Navid Moazzez
AI business strategist & AI OS builder
Navid Moazzez helps creators and founders master AI and build their own AI Operating System (AI OS) to automate their business and life.
Navid.me is reader-supported. When you buy through links on this site, I may earn an affiliate commission. Learn more.
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