Check blacklists

See if an IP address is on the most common email blacklists. If your mail server ends up on one, your email can be blocked or land in spam.

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Good to know

You'll find your mail server's IP address in the headers of an email you've sent, or from your email provider.
If you use Microsoft 365, Google Workspace or Zoho, your email is sent from the provider's servers. Their addresses are managed by the provider, not by you.
Being listed isn't always your fault. A previous user of the same address, or a neighbour on the same network, may have caused it.