What makes a good signature file?
The generally accepted answer to this question is that a signature file should be a file which contains information about the sender not available in the headers of the message. It is common etiquette to limit a signature file to 4 lines, max. This is not only because long signatures are annoying and silly, but also because the internet is worldwide, and in other countries people pay by the byte or the minute (or both) for internet access. That means they’re paying for your annoying 30-line signature file. This makes them quite angry. Some people have their signature start with “–“, that is, two dashes in a row, then a newline, especially on internet newsgroups. This is so that newsreaders can distinguish the “signal”, or body, of a message, from the “noise”, or signature, headers, and other unimportant bits, of the message.