More Email Information

As the Internet grows, comparability of Received fields is important for detecting problems, especially slow relays… Local time (with an offset) is preferred to UT when feasible. This formulation allows slightly more information about local circumstances to be specified.

– J. Klensin, Simple Mail Transfer Protocol; RFC 2821; April 2001.

See the Internet more information section for additional references. The following sections provide more information specifically about electronic mail: