This is a question I'm sure many out there have! There are a few steps you can take to let receiving servers know that it's OK to deliver emails you send using Emma's domain:
Whitelisting: Ask your IT Department to whitelist Emma's sending domain and IP range, found at the bottom of this link, if you're having internal delivery issues.
Setting your SPF record: For external delivery woes, ask your IT Department to register Emma as an authorized sender on your behalf. I always recommend this as a setting. It only helps. :)
Trusted/Safe Sender list: It's also always a good idea to ask your recipients to add the from address for your Emma campaigns to their address book and Safe Sender lists.
Here's a great checklist to have on hand, too. Of course, you'll also want to avoid words like FREE, MAKE LOADS OF $$$ and generally all-caps. Finally, I wrote a blog post this summer about Gmail's new tabs that I hope you'll find helpful. Give me a shout with any other questions about this!