Mass Mail: Email to Salesforce Enabled Email ~ salesforce.com - Enterprise Edition. Using Gmail in Salesforce. Important Once you activate a Google Apps service in Salesforce, it is visible to all users in your organization.
To use these services, your users must have Google Apps accounts on your domain. Guidelines on Using Email to Salesforce. Salesforce.com + Google Apps (Verdict: Good, but occasionally frustrating) I started using the Salesforce.com/Gmail integrated product this weekend and was largely happy with the experience.
The main thing for my company is getting information into one centralized system. We do so very effectively with our developer sites (wiki-based) but have been using SF.com with only middling success.