For the subject line, I usually write something along the lines of:
* "For [sales director OR office manager OR product manager first name] - [domain of current site] website question" (ideal, when individual contact information is available)
* "For board of directors - [domain of current site] website question" (for non-profit organizations, when specific individual info not available)
* "Please forward to owner - [domain of current site] website question" (for restaurants, clubs, bars, and small stores, when individual info not available)
* Plain "[domain of current site] website question" (for small companies, when individual info not available)
* "[domain of current site] website suggestion" (when filling out a feedback for that specifically "welcomes comment or suggestions")
* "Domain name of potential interest to [company name]" (for large corporations)
I have NOT had any luck with:
* "For sales - [domain name of current site] website question"
...so I would advise against using it.
Based on sheer cognition, I would ABSOLUTELY advise against subject lines containing these:
* "Domain name for sale!"
* Anything with exclamation points or all-caps. Profoundly unprofessional.
* "Important and confidental", "Urgent matter for your attention", and the like. I receive about 25 e-mails with subject lines like these on my AOL account daily, and they all drop straight into my spam folder.
I'm not sure whether these subject lines are optimal, but I have made about $2K in closed + $1K in pending sales over the past 2 weeks, mostly using my e-mail pitch:
http://www.namepros.com/showthread.php?p=3043972#post3043972
My follow-up for SpritOfLiberty.com consisted of 3-minute phone call at the recipient's request, but my original pitch was through e-mail.
I've experienced the most luck with niche hardware / consumer goods shops, film directors, and graphic designers; the least luck with doctors, real estate agencies, VC groups, consulting firms, and large corporations (unfortunately the folks with deepest pockets).
Please let me know if there's any way I can help. Some of you folks have sent me PM asking me to broker deals, but I must duly pass since I spend most of my time cultivating my startup company, and I haven't yet learned how to slow the earth's rotation. One day...