Example mail and reply email:
Reply email with standard quoting:
Note 1:
The quoted parts are prefixed with "> ", which is commonly recognized by standard email clients. An additional quotation level adds yet another "> " prefix.
Note 2:
Modern email clients properly quote the texts from previous replies automatically.
Note 3:
Common email clients typically use these prefixes to display the quoted parts in a different way to make it easier to tell them apart from the actual reply text. For example:
Note 4:
Any information not addressed by the reply, and any information that is not important for the reply has been removed. Optionally replace removed texts with {{[..]}} (to indicate that there was some more text previously).