not as simple or straightforward as it seems
as a film about poetry, passion/love, it isn't surprising that Il Postino isn't as straight forward/simple as it may seem on the surface...
to me the clue lies in our simpleton's life after he marries Beatrice... it certainly isn't your usual romance where the get together is the be all and end all of the story... it seems that his real love is rather neruda's poetry, and to prove his heroic passion he dies in the process...
it is certainly like a sad romance where one might fall short of their goal... mario was not a great writer but he at least lived his life trying to fulfill that dream... and on the way he created his own legend in the shadow of his friend neruda...
the biggest clue to this is when beatrice is fed up with this obsession such as with naming his child pablito... and mario goes on to great lengths to be recognised or respected by neruda (even though he sadly feels that Neruda has forsaken him or just used him or laughed at him behind his back), despite all these doubts mario still strives forward in a manner in which to me represents unconditional love...
when he was crushed (was it love or just a crush?) amongst the followers, it may be sad that he didn't know that Neruda actually did care... but in unconditional love that doesn't matter... the postman has established himself as a true lover...
Carpe Diem