This is the 18401st most frequent Russian word.
электронно
"Electronically."
Here, 'электронно' is used as an adverb describing the manner of receiving a letter, indicating it was done by electronic means.
Я получил письмо электронно.
I received the letter electronically.
In this sentence, 'электронно' modifies the verb 'отправить', describing that the application can be sent in an electronic format.
Вы можете отправить заявку электронно.
You can submit the application electronically.
The term 'электронно' here is an adverb showing the manner in which the document was signed, suggesting the use of electronic signing methods.