発信 はっしん しゃ表示 ひょうじじゃありませんでした
hasshinshahyōjijārimasendeshita

Noun
Desu Copula

The polite, past negative form of 発信者表示

1. Was not the sender.; Was not displayed as the sender.

Past/Perfective
Negative
Polite
Terminal Form
Computing