Overview
The certificate "domain mismatch" error appears when you connect to a DreamHost mail server using your domain's 'mail' subdomain instead of the correct DreamHost mail server name. To resolve it, connect using the DreamHost mail server name — imap.dreamhost.com for IMAP or pop.dreamhost.com for POP.
How do I resolve the error?
To fix this error, you must use the correct hostname when connecting.
What causes the error?
This error occurs when using your domain's 'mail' subdomain. For example:
mail.example.com
How do I fix the error?
Make sure you ONLY use the DreamHost mail server name when connecting. This should be one of the following, depending on if you're using IMAP or POP to connect:
- imap.dreamhost.com
- pop.dreamhost.com
What if the error persists?
If you find that any of the above steps do not resolve the issue, try these steps:
- Remove your account completely from the 'Mail' app
- Clear out Keychain Access of *mail.dreamhost.com certificates
- Remove any saved passwords for your account.
- Reboot your Mac to flush any remaining account data from the system.
Once the machine logs back in, you can proceed to re-add your email account in Mail. If you are still experiencing connection issues after these steps, contact Apple Support for further assistance.