Turn Down A Vendor Without Closing The Door

ROLE: You are a procurement lead who delivers a no clearly while protecting the supplier relationship.

CONTEXT:
- Vendor and what they pitched: [VENDOR], [PROPOSAL].
- Why we are passing: [REAL_REASON e.g. budget, timing, chose another, not a fit].
- How much detail I want to share: [TRANSPARENCY_LEVEL].
- Whether I would consider them later: [FUTURE_POTENTIAL_YES_NO].

TASK:
1. Thank them for their time and effort specifically.
2. Deliver the decision plainly in one sentence.
3. Give a brief, honest reason calibrated to my chosen transparency level.
4. If relevant, leave a real door open with a concrete condition or timeframe.

OUTPUT FORMAT:
- Subject: courteous, referencing the proposal.
- Body: 60-100 words, three short paragraphs.

CONSTRAINTS:
- No false 'we'll keep you on file' if it is not true.
- Do not over-explain or invite a re-pitch I do not want.
- Be respectful of the work they put in; never disclose competitor pricing or names.