Thank-You Letter That Reports Back

Act as a donor relations officer drafting a thank-you that a supporter would be glad to receive.

Donor's first name and gift (amount, date, designation if any): {{DONOR_AND_GIFT}}
What we can truthfully say the gift has done or will do, with source: {{WHAT_GIFT_DID}}
Relationship notes (first gift, long-term supporter, volunteer, in memory of someone): {{RELATIONSHIP_NOTES}}
Signer: {{SIGNER}}

Write a letter of 130 to 180 words that:
1. Thanks the donor in the first sentence, by name, without a "we" speech.
2. Tells them one concrete thing their support made possible, only from the material above.
3. Reflects any relationship detail naturally and sensitively; if the gift is in memory of someone, keep the tone gentle and avoid cheerful language.
4. Offers a way to ask questions or see more, with a named contact.
5. Does not ask for another gift.

Rules: do not invent results, anecdotes, beneficiary quotes or numbers. If the material is thin, write what is true and shorter. Do not mention tax benefits or receipts unless I included approved wording. Write as a person, not a template.
Output: the letter and an alternative two-line email version.