This file is indexed.

/etc/dovecot/conf.d/01-mail-stack-delivery.conf is in mail-stack-delivery 1:2.0.19-0ubuntu1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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# Some general options
protocols = imap pop3 sieve
disable_plaintext_auth = yes
ssl = yes
ssl_cert = </etc/ssl/certs/ssl-mail.pem
ssl_key = </etc/ssl/private/ssl-mail.key
ssl_cipher_list = ALL:!LOW:!SSLv2:ALL:!aNULL:!ADH:!eNULL:!EXP:RC4+RSA:+HIGH:+MEDIUM
mail_location = maildir:~/Maildir
auth_username_chars = abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ01234567890.-_@

# IMAP configuration
protocol imap {
        mail_max_userip_connections = 10
        imap_client_workarounds = delay-newmail
}

# POP3 configuration
protocol pop3 {
        mail_max_userip_connections = 10
        pop3_client_workarounds = outlook-no-nuls oe-ns-eoh
}

# LDA configuration
protocol lda {
        postmaster_address = postmaster
        mail_plugins = sieve
        quota_full_tempfail = yes
        deliver_log_format = msgid=%m: %$
        rejection_reason = Your message to <%t> was automatically rejected:%n%r
}

# Plugins configuration
plugin {
        sieve=~/.dovecot.sieve
        sieve_dir=~/sieve
}

# Authentication configuration
auth_mechanisms = plain login

service auth {
  # Postfix smtp-auth
  unix_listener /var/spool/postfix/private/dovecot-auth {
    mode = 0660
    user = postfix
    group = postfix
  }
}