emailTools · Deep email check · no sign-up
Is an email address real? Run a deep check.
Paste an address and get a 0-99 score in seconds. We check its format, the provider's username rules, throwaway and role addresses, and the domain's MX, SPF, DMARC, DKIM, MTA-STS and BIMI records. No email is sent.
Bots and scripts can call GET /v1/check with no key (API docs).
- Format and provider rulesGmail, Outlook, Yahoo and more
- Throwaway and role addressesDisposable domains, info@, admin@
- MX, SPF, DMARC, DKIMCan this domain get and sign mail?
- MTA-STS, TLS-RPT, BIMIHow well the domain is set up
All tools
Small tools for people who put email into apps, and one for your own mailbox.
Each one answers a question that's hard to answer by guessing. Most need no sign-up.
Deep email check
Is an email address likely real? Format, provider rules, throwaway and role addresses, and the domain's MX, SPF, DMARC and DKIM records, with a score. No email is sent.
Your own mailboxGmail cleanup
Connect Gmail, let email59 review dates, senders and subjects (never the body), and move years of old notifications, Promotions and no-reply mail to Trash in one go. Needs a sign-in.
Your domainDMARC digest
A free address for your domain's DMARC reports. We open the daily files from Google, Microsoft and Yahoo and show who sends mail as you, what passed and what to fix, with a weekly email if you want one. Needs a sign-in.
Sign-in linksLink scanner test
Email yourself a test link and see every request it gets: which network, GET or HEAD, and whether a mail filter opened it before you did.
Sign-in codesSign-in code guess odds
Code length, tries per code and codes per hour in; the chance that someone guesses one per day, per month and per year out. Runs in your browser.
DevelopmentDev mail fence
One send function in Python, JavaScript, PHP, C# or Go that captures mail in development, redirects it on staging and only delivers in production. Runs in your browser.
BouncesBounce reader
Paste a bounce line such as 550 5.1.1 and see whether it is temporary or permanent, about the address or about you, and whether to wait, stop or fix something. Runs in your browser.
Your own mailboxHeader reader
Gmail warned you about an email, or yours lands in spam? Paste the headers from Show original and see whether SPF, DKIM and DMARC passed for the domain in From, in plain words. Runs in your browser.
Account emailsPrice-change notice planner
Raising a subscription price? Give the date it starts, monthly or annual, and where subscribers are: the day to send each notice (California 7 to 30 days, New York 5 business days to 30, UK and EU) and the reminder, with a CSV. Runs in your browser.
Small business emailLate payment interest calculator
A business paid your invoice late? The UK and EU give you interest and a fixed sum on top. Enter the amount and dates: the rate for that half-year, interest per day and in total, the £40, £70 or £100 band, and a paragraph for the reminder email. Runs in your browser.
Small business emailOut-of-office writer
Your dates away and who covers: the subject, a fuller reply for contacts, a short one for strangers with no names or phone, and the Gmail and Outlook steps with your dates filled in. Runs in your browser.
Small business emailSignature maker
Name, role, business and one phone or link, plus the web address of your logo: a four-line signature whose logo shows instead of arriving as an attachment, the plain-text version and copy buttons for Gmail and Outlook. Runs in your browser.
Shop emailsTracking link maker
Paste a tracking number and get the carrier's link with the number already in it, a plain-text line and a button for your shipped email. USPS, UPS, FedEx, DHL, Royal Mail, Canada Post, Australia Post and India Post, check digits tested. Runs in your browser.
Writing emailPlain-text twin
Paste an email's HTML and get a first draft of its plain-text part, links written out. Edit it while the page checks that every link, code and amount is in both. Runs in your browser.
Sign-up formsEmail typo catcher
Type an address or paste a list and see which domains are a slip away from gmail.com, hotmail.com and other well-known ones, with the "Did you mean" to show. Runs in your browser.
Small business emailGmail stops fetching your mailbox
Gmail ends "Check mail from other accounts" (POP) and Gmailify in January 2027. Enter your business address: we check its domain and pick forward, the Gmail phone app, a one-time copy or a new mailbox, with a dated checklist.
Small business emailNew address checklist
Moving from an old Gmail to a business address? Tick the accounts you have and get them in the order that matters: bank, tax, domain and password resets first, with a date for each. Printable, saved in your browser.
Sign-up formsSame mailbox finder
Paste your sign-ups and see which addresses reach one inbox: Gmail dots, plus tags and googlemail.com folded, with the comparison key for each. Runs in your browser.
Sign-in codesVerify API test page
Send yourself a verification code and check it, the way your app would with two API calls. Needs an API key.
Then send the email
email59 is an email router with a small API for sign-in codes, alerts and notices. No domain setup.