Guides › DKIM
How to find your DKIM selector
DNS has no way to list DKIM selectors, so you need to know the name to look up the key.
1. Read an email header (most reliable)
Send yourself an email from the service, open "Show original" (Gmail) or "View source", and find the DKIM-Signature header. The s= value is the selector and d= is the domain.
2. Check the provider's dashboard
Every provider's DKIM setup page shows the record name, such as s1._domainkey.
3. Common defaults
| Provider | Selector(s) |
|---|---|
| Google Workspace | |
| Microsoft 365 | selector1, selector2 |
| SendGrid | s1, s2 |
| Mailchimp | k1, k2, k3 |
| Mandrill | mandrill |
| Fastmail | fm1, fm2, fm3 |
| Proton | protonmail, protonmail2, protonmail3 |
| Amazon SES | random tokens |
| Postmark | date-based, e.g. 20240101xxxxpm |
The checker tries 20 common selectors automatically and also accepts a custom one.
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