So, I was doing a little research on this for a client of mine and saw this short video which gives you a flavour of how easy it is to get your CRM's (e.g. SalesForce) email addresses into your email campaign software list (e.g. MailChimp) automatically.
Zapier can also be used to move data from software such as CANDDi into your CRM first.
Check out Zapier at https://zapier.com/ and have a quick look at the video to see how easy it can be,
Zapier makes it easy to move Salesforce contacts or leads directly into your Mailchimp mailing lists without writing a single line of code.