telepost

plural teleposts

1. historicalA message of up to 100 words transmitted by telegraph at the post office.

   A telepost is a dispatch of 50 words, between all points, for 25 cents, delivered at the post-office.

   1910, United States Congressional Serial Set, volume 5592, page 4

   2 more examples

   […] sending telegrams of 50 words, teleposts of 100 words, and teletapes of 200 words for 25 cents, […]

   1860, John Alexander Anderson, A Postal Telegraph Essential to the Freedom of the American Press and the Prosperity of the American People

   It is only by the utilization of the full facilities of a wire that a telepost service can be established. Cheap rates are impossible at nine words a minute.

   1908, Telegraph Age, volume 25, page 201