It would be great if a common signature delimiter could become a standard as well. Then email clients could automatically delete the signature from the quoted text when you compose a reply, for example.
Use the Standard Signature Delimiter
The "standard" that is widely used on Usenet, but also with email, is
- "-- " (two dashes followed by a white-space character) on a line by itself.
Example Signature with Standard Delimiter
A signature conforming to the standard could look like:
"eve rythin gisgon nabeal right"