This is the 6896th most frequent Turkish word.
bültenle
"With the bulletin."
Here, 'bültenle' is used as an instrumental case form of 'bülten', meaning 'with a bulletin', indicating the means by which the news was announced.
Yeni haberleri bültenle duyurduk.
We announced the new news with a bulletin.
In this sentence, 'bültenle' again refers to 'via the bulletin', demonstrating its use to describe the tool or medium used for communication.
Katılımcılar için gerekli bilgiler bültenle iletildi.
Necessary information for the participants was conveyed via the bulletin.
Here, 'bültenle' implies 'with the bulletin', showing its function as an adverbial modifier explaining the medium accompanying the email.