Subject lines should aid the retrieval of appropriate information for months or years in the future. When emailing, try to speak as if you were in front of another person. It is inappropriate to use inflammatory language or personal attacks in list postings. This IS monitored on PHYS-L and all of the above physics lists. Moderators and list owners work hard at keeping tone appropriately professional, welcoming and supportive for all list members.
Fine conversation has give and take.
Readers cannot hear the tone of your voice when you write, making it especially dangerous to convey sarcasm. if you do receive an attachment document or executable file from any list, quarantine this file in a download folder and run a virus detector over it before executing or opening.