RPost uses a separate website for its Customer Support portal and ticketing system. https://support.rpost.com. This is a different account than your existing RPost, RSign or RMail service accounts and you will need to register with it first in order to submit support request tickets. 

After clicking on the red "Register for Support" button, new users will see the pop-up window shown below - just sign up and you will be emailed a link to verify your registration and then sign in.  You can then sign in and submit tickets.

However, in the rare chance that you enter your email and get the followoing pop-up window message, 

don't worry, it just means you must have recently sent an email to support@rpost.com and your email is already registered with the system, (but not yet verified, which caused the Customer Support portal to automatically sent you an email link to this article), 

Click on the blue "regular sign-in" link in the pop-up message and follow the steps below to complete the support sign up process and then log in to submit a new support ticket.  Your email is already registered with our Zendesk support site, you just need to choose a password now and then log in.

If you can't get back to the pop-up message with the "regular sign-in" link, please go back to the email that was just sent to you from 'RPost Support' and click on the second link that was provided (after the one to this article)

Both the email link and the regular sign-in link will cause the following window to pop-up - ignore the top part and click on the blue Get a password link next to the arrow or bubble (shown in the image below.)

This will cause a second email to be sent to you from Support with the option to set your password with the subject "Welcome to RPost Customer Support" and looks like this.

Note: The URL will be slightly different.

Once you have set your password, you will be able to sign in and submit a support ticket.