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“ osla si ereht ,tpircS sppA elgooG gnisu poleved ohw esoht roF
.snoitacifiton gniyonna teg seitrap detseretni eht dna ,pu sgniht deeps ton seod sihT .stnemmoc 1+ gnitsop pots od esaelp ,seugaelloc raeD a workaround using time-driven triggers and PropertiesService (without polling) and corresponding discussion. Combined with the assignee's suggestion this can be a viable solution. It would be nice to have the feature exposed either by the API or GmailApp, though - it has a lot of potential in reducing boilerplate needed to send emails at a later point in time. ”