Write 25 email subject lines that lift open rates

You are a senior email marketing copywriter and deliverability specialist who has A/B tested thousands of subject lines and knows what earns the open in a crowded inbox.

Write 25 distinct email subject lines for the campaign described below, engineered to lift its open rate. Aim for a set I can A/B test with confidence: every line front-loads its hook, stays deliverable, and the 25 spread across a deliberate range of angles so I'm comparing real approaches, not near-duplicates.

Campaign brief:
"""
Product / offer: {{product}}
Audience: {{audience}}
Brand voice: {{brand_voice}}
Email type: {{email_type}}
What the email says (facts, offer, key message): {{email_summary}}
Action I want after they open: {{desired_action}}
"""

Steps:
1. Read the brief and name the single most compelling, TRUE reason this audience would open — the one benefit, tension, or piece of news the subject line should sell.
2. Decide the mobile front-load: most inboxes cut the subject off around 40 characters, so the hook has to land in the first few words.
3. Write subject lines across at least seven of these angles, and label each line with the angle it uses:
   - Curiosity gap (open a loop the email closes)
   - Specific benefit or outcome
   - Pain-point question (specific, never generic)
   - Number or list
   - Direct and personal (reads like a note from a human)
   - Story tease
   - Genuine urgency or scarcity (only if the brief gives a real deadline)
   - Social proof or result
   - Contrarian / pattern interrupt
   - Timely hook (tie to a date, season, or event)
4. Vary the length: a few short (under ~30 characters), most in the 30-50 range. Short and specific usually beats long and clever.
5. Pick the 3 strongest lines and write matching preview (preheader) text for each — 60-100 characters that extend the subject instead of repeating it.

Output format:
- A table with columns: # | Subject line | Characters | Angle | Why it earns the open (one line).
- Below it, a "Top 3 to test first" section, each line shown with its preview text.
- A final "Before you send" note listing any missing facts that would make the lines stronger.

Constraints:
- Use only facts from the brief. Don't invent statistics, discounts, names, or claims. If a strong angle needs a detail you don't have, write the line with a clearly bracketed placeholder like [result] and flag it — never fabricate.
- If the brief is too thin to write honestly compelling lines, say so and list the 2-3 details you need before generating.
- Keep the emotional trigger inside the first ~30 characters so it survives mobile truncation.
- Skip deliverability risks: no ALL-CAPS words, no "free / guarantee / act now" spam phrases, no "!!!", and at most one emoji, used only if it fits {{brand_voice}}.
- Make every question pain-specific; drop generic openers like "Quick question" or "Have 15 minutes?".
- One clear idea per line — favor specificity over cleverness.
- Personalize by relevance and segment, not by merging a first name into every line (name-merge can read as automated and lower replies).
- Match {{brand_voice}} and write in sentence case unless the brand is deliberately loud.

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