Hi James
Many thanks. This is exactly what I was looking for.
So the e-mail link points to my SEPM as follows
http://<server_name>:8014/EmailInstallPackages/56727A070A00010401AB0C9800A4462D_WIN64BIT/sep/Setup.exe
Guess I need to open port 8014 from outside to my SEPM for this to work. This is the same port used for general client to SEPM communication, so this should be open in the first place.
It is possible to change this port to SSL (port 443). I assume this also applies to package deployment, so in such cases I don't need to open 8014 as well.
Regards,
Thomas