Use a custom domain for the webmail
If you're a company or a reseller, you may want your users to access the webmail from a different address than postale.io/webmail. Here's how to do that.
Try with webmail.yourdomain.com.
Add a CNAME record
Login to your domain provider and add this CNAME record in the DNS editor.
Host Value webmail webmail.postale.io.
That's it! Once the new record has propagated you'll be able to access the webmail from webmail.yourdomain.com.
The webmail is SSL encrypted for better security (https). To preserve this, when you access it via webmail.yourdomain.com the address shown in the browser address bar is automatically changed to webmail.postale.io.
Premium Plus users can also customize the webmail and admin branding (white labeling).