There is a mailing for small groups? Yes, it does exist. Look and read this experience ( click here to download the letter they sent).

Our association has tried to implement the project of the 1000 letters in favor of our family house. The project we called "Shared Accommodation" and we sent 1100 letters, almost all the women as
She had suggested. We have identified three types of people and then three different types of letters:
1 - To the members
2 - To the friends of the association, that is, to those who already know us
3 - unknown

A major difficulty in the expedition was to eliminate duplication, because the double surname
the Lord and any nicknames with which we had been reported the names they gave us trouble.
The letters were sent in March and despite the skepticism of many contributors we've had a good
the result. So far 85 people have responded and we came to 11,000 euros. Of course we responded by thanking everyone and we prepared a small gift made ​​in our laboratories, asking to come and get to know our structure. This unfortunately is taking place. Thank you again for the beautiful lessons and advice received and greeted her warmly.