POP3 LOG DELETE

Hi, I have a scenario where the user is downloading messages via POP3 on a local server with postfix and fetchmail. And it is claiming that when downloading locally some messages are disappearing. The problem is that I didn't identify any way to validate that this message was actually downloaded, besides the standard logs with the reference del=2/2~*/*, example: 1 - Oct 25 08:02:27 cloud dovecot: pop3(domain)<17397>: Disconnected: Logged out top=0/0, retr=0/0, del=0/0, size=0, bytes =12/43 2 - Oct 25 08:03:30 cloud dovecot: lmtp(domain)<17522>: msgid=<95f8acb687ff43ef8f896a1ef27d29ff@1039565501>: saved mail to INBOX 3 - Oct 25 08:04:24 cloud dovecot: lmtp(domain)<17522>: msgid=: saved mail to INBOX 4 - Oct 25 08:04:26 cloud dovecot: pop3-login: Login: user=, method=PLAIN, rip=187.16.96.34, lip=187.108.203.207, mpid=17711, TLS, session= 5 - Oct 25 08:04:26 cloud dovecot: pop3(domain)<17711>: Disconnected: Logged out top=2/89508, retr=0/0, del=2/2, size=89497, bytes =88/89743 My question is whether there is any way to validate how, when and where the message was downloaded via POP3. In addition to the standard paths; var/log/exim_ & maillog Tyyy