This is the 8844th most frequent Russian word.
почтовый
"Postal."
Adjective describing the noun 'служба' (service), indicating its function related to the postal system.
Я отправил письмо через почтовую службу.
I sent the letter through the postal service.
Adjective describing the noun 'отделение' (office), specifying its previous role related to the postal system.
Это здание раньше было почтовым отделением.
This building used to be a post office.
Adjective describing the noun 'марка' (stamp), specifying its type as related to mailing.