Shipmondo allows you to have one email address linked to multiple Shipmondo accounts as staff members.
This requires that the email address in question is not already in use as a main company account mail at Shipmondo.
You can see which account/company you're logged into if you look at the upper right corner of your Shipmodno account.
If your staff account has access to several, different company accounts at Shipmondo, you can easily switch between them, without having to log out first.
You can do the switch by clicking on your company logo in the top right corner.
Click on Company and then chose the company account you wish to access.