This is the 5th most frequent Norwegian word.
ble
"Ble" in Norwegian means "became" or is the past tense of "bli" (to become).
In this sentence, 'ble' means 'became', indicating a change of state from not being happy to being happy.
Jeg ble glad da jeg hørte nyhetene.
I became happy when I heard the news.
In this case, 'ble' is part of a passive structure, implying that the decision was made by someone or something, unspecified in the sentence.
Det ble bestemt at vi skulle dra tidlig.
It was decided that we should leave early.
Here, 'ble' is used as an auxiliary verb in a passive voice construction, showing that the action of sending was done to the email.