UPDATE: I found these lines too
Aug 4 11:52:08 vps1 dovecot: service=imap,
[email protected], ip=[185.30.177.70]. Debug: Mailbox INBOX: Mailbox opened
Aug 4 11:52:08 vps1 dovecot: service=imap,
[email protected], ip=[185.30.177.70]. Debug: Mailbox INBOX: UID 23859...