Email header analyzer
Trace your email's delivery path and check SPF, DKIM, and DMARC authentication results
SPF, DKIM, and DMARC checker
Check your domain's email authentication DNS records and diagnose deliverability issues
IMAP connection tester
Start a private IMAP test server and watch your email client's exact connection as it happens
POP3 connection tester
Use a real POP3 test server to validate your email apps without affecting real data
SMTP connection tester
Spin up a real SMTP test server and diagnose your email sending configuration in real time
EML file importer
Import a saved .eml file directly into your Gmail or Microsoft 365 mailbox (Auth-Email account required)
EML viewer and converter
Open and read EML files in your browser — view attachments and convert to plain text or HTML
MSG file viewer
Open and read Outlook .msg email files in your browser — no Outlook or Windows required
MIME structure viewer
Explore the technical structure of an email from its source code or an EML file — useful for debugging
Winmail.dat opener and extractor
Open, read, and extract the contents of winmail.dat, ATT00001.dat, and TNEF files
Tenant ID finder
Find your Microsoft 365 / Entra / Azure / Office 365 tenant ID from a domain name
Tenant name lookup
Look up an organization's name and primary domain from its Microsoft 365 tenant ID
Admin consent URL generator
Generate the URL to authorize an OAuth app — including Auth-Email — with your Microsoft 365 organization