Questions & Answers about Rileggo la mail e poi controllo l’allegato.
Because they are in the first person singular of the present tense: I reread / I check.
- rileggo = I reread
- controllo = I check
In Italian, many present-tense verbs used with io end in -o:
- parlo = I speak
- vedo = I see
- scrivo = I write
So here the subject is I, even though Italian does not need to say io explicitly.