"enter the post" is correct and usable in written English.
It is typically used as an imperative to imply that one should go to the post office. For example, "Please enter the post to purchase a new stamp for the package."
The courses in Washington also offer such simple advice as "Don't let strangers into the listening post," "If a janitor or some building official must enter the post, cover the equipment with clothing or a newspaper," "Never leave any notes or reports behind you when you leave your post".
As we enter the post genome-sequencing era, we are already facing new challenges.
Patients are permitted up to a maximum of 6 cycles of chemotherapy, after which they will either enter the post treatment states of Stable or Response until they enter Progression.
We will enter the post-Trump future with decimated federal agencies and a frayed judiciary stacked with Trump appointees.
Earlier this year, the rerun of that uprising saw the fascist Svoboda and Right Sector parties enter the post-revolutionary government.
It has offered the first real sign that the Republican Party might someday escape the shadow of the Iraq war and enter the post-post-9/11 era.
As we enter the post-Moore's law era of computing, unconventional architectures will offer specialized models of computation that uniquely support specific problem types.
"As we now enter the post-election phase, I look forward to working with vice-president-elect Pence and the rest of the leadership team to implement that template as we prepare for January 20 , 2017.
Although some small primitive mammals had lived in the shadow of the great Cretaceous reptiles, the scientists could not find evidence supporting an earlier hypothesis that up to 39 placental mammalian lineages survived to enter the post-extinction world.
(Teams play overtime only in the playoffs). The not-so-mighty Phantoms would have to win the final two games of their season to enter the post-season competition.
