Thank you for all responses about this topic.
I would also solve a more practical doubt finally: if I use for example the PHP code 'POP3class', as suggested by Manuel Lemos, it's implicitly meant that it should run periodically on a web-server (for example, under a timer of a given number of seconds), don't you?
Example: check pop3 mailbox every 5 secs by php code and then perform all the required actions.
Yes, but perhaps every 5 minutes. You have to solve this too, either cron job if you have it available or it can be trigered by user http requests (not very reliable).
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