Create a signature for consistency. Keep it short and concise. Include your e-mail address in case the signature gets separated from the banner. Don't duplicate in your signature any material you have in your e-mailhead. Capitalizing, and other odd things.
Business communication requires proper use of written language.
It requires proper use of capital letters. This is rude and slovenly when used in inter-company communications. Specifics internet - is a generic term, not a proper noun. Use lower case and capitalize only at the beginning of a sentence. By today's rules, this is not correct, but English is a living language with custom a major factor.