Postfix/Dovecot Mail not being delivered

[russellw]

Centos 7 running Dovecot 2.2.36 and Postfix 2.10.1.

Users (all with named user accounts) with mail accounts on our server can't download any mail whether it is internal or external. The mail is visible using Webmin and it's stored in /var/spool/mail/username but a check of the mail-log entries only shows a successful log in and nothing to retrieve.

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dovecot: pop3(admin): Disconnected: Logged out top=0/0, retr=0/0, del=0/0, size=0

It has been working fine for years so I'm puzzled as I can't see any config changes. The output from Dovecot -n is as follows:

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auth_verbose = yes
debug_log_path = syslog
disable_plaintext_auth = no
info_log_path = syslog
mail_privileged_group = mail
mbox_write_locks = fcntl
namespace inbox {
  inbox = yes
  location =
  mailbox Drafts {
    special_use = \Drafts  }
  mailbox Junk {
    special_use = \Junk  }
  mailbox Sent {
    special_use = \Sent  }
 mailbox "Sent Messages" {
    special_use = \Sent  }
 mailbox Trash {
    special_use = \Trash  }
 prefix =}
passdb {
  driver = pam}
pop3_uidl_format = %v.%u
protocols = pop3
ssl = no
ssl_cert = </etc/pki/dovecot/certs/dovecot.pem
ssl_key =  # hidden, use -P to show it
userdb {
  driver = passwd}

Each user has a Maildir folder in /home although these don't look to have been written to in a very long time (>10 years).

Any guidance is appreciated.