File type: Signature
The SIG file extension is used the file extension for the small text files that may be automatically attached or embedded to the end of email messages.
These small text files usually include the name and the email address of the sender and for work email, the file may also include the company name, the title of the person and the phone numbers.
Some people also choose to include a Bible verse or a quote in their email signature. Most email programs also support different signature files. These may be selected from the 'create new mess.