▁via ▁Den mark ▁period ically ▁was ▁interrupted , ▁the ▁mail ▁from ▁Sweden ▁to ▁Germany ▁was ▁often ▁directed ▁either ▁via ▁Finland ▁and ▁T all inn ▁or ▁via ▁se away ▁to ▁R iga . ▁This ▁background ▁explains ▁the ▁appointment ▁in ▁ 1 6 2 5 ▁of ▁Jakob ▁Be cker ▁of ▁R iga ▁as ▁Post master ▁for ▁Liv onia ▁and ▁Pr uss ia . ▁In ▁ 1 6 3 1 ▁Be cker ▁was ▁made ▁responsible ▁for ▁the ▁printing ▁shop ▁of ▁the ▁University ▁of ▁T art u . ▁The ▁public ▁notice ▁" Post ordnung " ▁of ▁ 2 6 ▁September ▁ 1 6 3 2 ▁printed ▁in ▁T art u ▁by ▁Be cker ▁can ▁be ▁considered ▁to ▁be ▁the ▁opening ▁date ▁for ▁general ▁mail ▁in ▁Est onia . ▁ ▁History ▁ ▁After ▁the ▁end ▁of ▁the ▁Great ▁Northern ▁War ▁Est onia ▁was ▁incorpor ated ▁in ▁the ▁Russian ▁Empire ▁through ▁the ▁Peace ▁of ▁U us ik au punkt i ▁( N yst ad ) ▁in ▁ 1 7 2 1 . ▁This ▁period ▁of ▁Est onian ▁history ▁began ▁already ▁with ▁the ▁surrender ▁of ▁T all inn ▁in ▁ 1 7 1 0 . ▁The ▁needs ▁for ▁a ▁properly ▁function ing ▁postal ▁service ▁had ▁become ▁so ▁important ▁that ▁already ▁in ▁the ▁negoti ations ▁about ▁the ▁capit ulation ▁one ▁of ▁the ▁conditions ▁of ▁the ▁cities ▁was ▁that ▁post ▁offices ▁should ▁be ▁re - open ed ▁and ▁that ▁postal ▁communic ations ▁with ▁neutral ▁countries ▁should ▁remain ▁open . ▁These ▁conditions ▁were ▁accepted ▁by ▁the ▁Russian ▁authorities . ▁At ▁the ▁beginning ▁the