When you create the first email address for a domain (that is configured to be hosted with DreamHost), the system will also set up hostnames for Webmail service.
After you add the first email address, it could take 4-6 hours for the DNS to update online. Only after the DNS updates will you be able to access webmail. Any additional addresses you add are immediately available.
Webmail is located at:
http://webmail.example.com -or- https://webmail.example.com
Be sure to replace example.com with the actual domain.
It is also accessible using the DreamHost domain:
http://webmail.dreamhost.com -or- https://webmail.dreamhost.com
Webmail is automatically configured to connect to the DreamHost mail server. The only settings you must enter are a mail account username and password to log in.
The security certificate used by Webmail is written for the dreamhost.com domain. If you access Webmail using webmail.example.com (example.com being your personal domain), the certificate's domain will not match your domain. You can avoid any warning or error message from this domain mis-match by accessing Webmail using webmail.dreamhost.com.
You can also accept any certificate mismatch warnings and store that certificate exception through the web browser so the prompt doesn’t come up again through the browser on which it was stored.