Each Dotpost account must have a unique email address. 

It is not recommended to utilise shared or joint email addresses but understand that this is required in some circumstances.

If multiple people use the same email address, for example a partner, you can only register once using this email address.There can only be one Dotpost inbox for each email address.  This means that anyone using the email address would be able to see all the content in the Dotpost inbox provided they know the password and security details. 

If you receive separate activation codes and are happy to share all the content then add all activation codes to the one "shared email" Dotpost account via Add New Sender.

If you wish to keep your individual content separate, then you will need to use separate Dotpost accounts each with their own unique email address.