Things to do with Lead Liaison's support_

Setup DKIM/DomainKeys
Send from a dedicated IP address, not a shared IP address
Start by warming up your IP address and sending a small amount (<1,000) of messages
Process hard and soft bounce emails and test
Check blacklist records occasionally to make sure your dedicated IP address is not on any lists
Make sure you tag your contacts with a lead source
Segment current and future contacts by building segmentation lists
Build several landing pages and web forms to increase lead capture and build subscribers
Keep web form fields simple
Send a text representation with your html email
Monitor feedback loops and resolve spam complaints
Avoid using spam-like words ("free") in your messages