Dear XXX,

How is your job? Do you enjoy it?　

I started working on April 2nd and time has passed by quickly since. My life now is very different compared to when I was a student. I enjoy the change!　

This is my corporate signature at work now:
Haruko Tanaka
Assistant XXX,
Phone number: 123-456-7899
Haruko_Tanaka@abc.co.jp　

My business cards will be ready next week. I'll give you one when we meet next time!

Although I have a work email now, I still prefer to use my personal email address for non-business communications: Haruko.tanaka020@gmail.com　

I hope we can meet soon and talk about our new experiences.　

Best,
[your name]