送信 そうしん がわSPM えすぴいえむでしょう
sō shingawa esu pii emudeshō

Noun
Desu Copula

Expresses probability in a polite manner ("probably…") of 送信側SPM

1. Probably the sender's SPM.; Likely the sender's SPM.

Polite
Presumptive
Conjecture
Computing