1. One or more computer-readable storage device having stored computer-executable instructions that, when executed by a processor of a first network device of at least two network devices, implement a method for users of the at least two network devices to communicate via electronic mail, wherein the method includes: the first network device receiving a first electronic mail message; automatically, and without user intervention, extracting one or more language expressions associated with the first electronic mail message; displaying one or more language expressions associated with the first electronic mail message at the first network device; receiving a user selection of one or more of the language expressions displayed at the first network device; and including the selected language expressions in a reply electronic mail message to the first electronic mail message.