I have downloaded in MacMini MacOS X applications directory
the Dovecot.tzr.gz file from Dovecot v2.3.7.2 in https://www.dovecot.org/download

I have clicked on dovecot-2.3.7.2 tar.gz and it creates a dovecot-2.3.7.2 directory containung 35 files.

https://wiki2.dovecot.org/FrontPage?action=show&redirect=PageD%27Accueil#Dovecot_Wiki_Contents

https://wiki2.dovecot.org/FrontPage?action=show&redirect=PageD%27Accueil#Dovecot_installation

I have to compile to install in Terminal Application?

./configure
make
sudo make install

in https://wiki2.dovecot.org/CompilingSource#Compiling_Dovecot_From_Sources


without reference for dovecot.