Designing Social Inbox - Email Notifications

Over the past few months, I've been working almost exclusively on the frontend for HubSpot's Social Inbox. Early on, we knew we wanted to make notifications a central part of the system, and we wanted to take a mobile-first approach (while working within the limits of the greater HubSpot app). So we made a responsive email that was heavily influenced by the techniques implemented by Twitter. These are the email notifications we came up with. Also, my phone is in German.

Mobile:

There were two types of emails that you could receive: a list of tweet(s) or a forwarded tweet. They're pretty similar, but it was a good chance to test titles and subject lines.
Tweets from a customer's HubSpot Contact were annotated with a color to signify their lifecycle stage. Orange for leads, green for customers and grey if the person sorta matched one of your contacts.
I use Social Inbox to stay up-to-date on food startups in Boston.

Desktop:

The desktop version is very similar to the mobile one, but with more breathing room. We can (and should) add more web-only actions, to help people get a richer experience whenever possible. Would love to hear your thoughts.