SageCRM and Mailchimp

Hi there,

we are very new into SageCRM, integrated in Sage 100.

I wanted to setup a group to export into mailchimp. The group has nicely been created. But when it comes to send to Mailchimp it appears that the system tells me that at least 3 mailadresses are invalid. I checked the whole thing and theres no problems in the mailadresses. (Whole list is 1979 persons).
Also when I load the whole list manually into mailchimp theres no problems and all mentioned adresses are easily imported without any errors.

Anyone out there who can help??

Stephan