Link to add other email addresses is broken

In the user profile page, the link to add additional email addresses is broken.

There are several links thoughout hyperkitty that link to postorius pages. To fix this issue in a clean way, it would be nice to actually use the postorius urls.py file to resolve these addresses.

One sollution would be to require the use of namespaces (hyperkitty, postorius) for example and use these namespaces to link inbetween the two apps. Just using the defined names would not suffice because of possible collisions.

It would be better to have a way to resolve the urls without relying on the namespace since this is defined externally. However, till now I have not found any solution to this.