3. The method of claim 1 , wherein the lexical variants of the message text are created and tested in a plurality of phases, wherein the performance of lexical variants of the message text in one phase is used to determine the lexical variants of the message text that will be created and tested in a next phase.
3. The method of claim 1 , wherein the lexical variants of the message text are created and tested in a plurality of phases, wherein the performance of lexical variants of the message text in one phase is used to determine the lexical variants of the message text that will be created and tested in a next phase. 4. The method of claim 3 , wherein the lexical variants are categorized into families of words or word phrases having equivalent meaning or effect.