Write High-Converting Email Subject Lines

Generate high-converting email subject lines for the following:

Email type: [newsletter / promotional / onboarding / re-engagement / cold outreach / transactional / event / other]
Business or sender: [name and what you do]
Audience: [who receives this email]
Email content summary: [what is inside the email]
Goal of the email: [get opens / clicks / replies / purchases / attendance]
Current average open rate: [% or unknown]
Audience relationship: [warm subscribers / cold prospects / existing customers / mixed]
Tone: [professional / casual / urgent / witty / personal / bold]
Things to avoid: [spam trigger words / overpromising / specific phrases]

Generate a complete subject line toolkit:

50 SUBJECT LINES (organised by formula type):

CURIOSITY GAP (10 lines):
- Create an information gap the reader must fill
- Examples for this specific email

DIRECT BENEFIT (10 lines):
- Lead with the clear, specific value
- No cleverness — just clarity

PERSONALISATION (10 lines):
- Using name, company, behaviour, or situation
- How to insert dynamic personalisation

URGENCY AND SCARCITY (10 lines):
- Time-based and quantity-based urgency
- How to create urgency without lying

PATTERN INTERRUPT (10 lines):
- Unexpected, unusual, or counterintuitive lines
- Stand out in a crowded inbox

FOR EACH SUBJECT LINE:
- The line itself
- The psychological trigger it uses
- Best email type to use it for
- Risk level (safe / moderate / bold)

PREVIEW TEXT PAIRS:
- For top 10 subject lines: matching preview text that extends the hook
- How preview text and subject line work together

A/B TESTING FRAMEWORK:
- How to test subject lines properly
- Sample size requirements
- What to test first
- How to read results and scale winners

SPAM FILTER GUIDE:
- Words and phrases to avoid
- Formatting that triggers spam (all caps, too many symbols)
- Deliverability considerations
- How to test before sending