Google's Gmail Web-based email service runs on the Internet Message Access Protocol system, but it also offers Post Office Protocol mail server access.
Definition of LUMEN. 1. 2. : the bore of a tube (as of a hollow needle or catheter). 3. : a unit of luminous flux equal to the light emitted in a unit solid angle by a uniform point source of one candle intensity.
For other uses, see Lumen (disambiguation) . The lumen (symbol: lm) is the SI derived unit of luminous flux, a measure of the total amount of visible light emitted by a source.or other uses, see Lumen (disambiguation) . The lumen (symbol: lm) is the SI derived unit of luminous flux, a measure of the total amount of visible light emitted by a source.