Dear …
On behalf of __(name of organization)__, I would like to take this opportunity to thank you and your team members for your exceptional fundraising efforts in the __(name of fundraising event)__. This fundraising event proved to be an outstanding success. We are delighted to announce that your team contributed __($amount)__, which helped us to __(reach/exceed)__ our target of __($amount)__. In total, we were able to raise __($amount)__!
This was an amazing achievement for us and we are thrilled to be able to now provide __(extra/extended/a new/etc.)__ __( describe what the organization provides)__ for __(type of cause)__. We could never have done this without all your help and we just wanted to extend our greatest appreciation to you and your team for your tremendous contribution!
It was, indeed, my pleasure to have been a part of the __(name of fundraising event)__ this year and I want to thank you again for participating. Your efforts were exemplary!
Sincerely,