Find the mail servers of any domain
Results for
github.com
Mail servers
1 MX record
- Email provider
Microsoft 365microsoft.com
- First mail server
- github-com.mail.protection.outlook.compriority 0
- Priority 0github-com.mail.protection.outlook.com
Run this lookup from code
The API returns this result as JSON. The free plan includes 100 API calls per month.
curl "https://hostingchecker.online/api/v1/mx?query=github.com" \
-H "Authorization: Bearer YOUR_API_KEY"How it works
How email finds a domain's mail servers
To deliver a message, the sending server reads the domain after the @ and asks DNS for its MX records. It sorts them by priority, connects to the first host on port 25 and hands the message over. If that host does not answer, it tries the next one and keeps retrying for several days before it gives up.
MX records only decide where mail arrives. Which servers may send mail for the domain is up to its SPF record, and DKIM and DMARC prove that a message really came from the domain. Check all three with the SPF, DMARC and DKIM checkers once the mail servers look right.
FAQ
MX lookup FAQ
Common questions about MX records and email providers.
Related guides
Learn more from the blog
Step-by-step guides on reading and using these results.
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Find the mail servers of any domain
Look up the MX records of any domain. See its mail servers in the order senders try them and the email provider behind them, such as Google Workspace or Microsoft 365.