fix(mda): potential bugfix for the 2.4.3 macos/ios errors

Author: jeboehm

target/mda/rootfs/etc/dovecot/conf.d/10-mail.conf

@@ -1,9 +1,11 @@
 mail_driver = maildir
 mail_home = /srv/vmail/%{user|domain}/%{user|username}
 mail_path = /srv/vmail/%{user|domain}/%{user|username}/Maildir
+mail_attachment_detection_options =
 mailbox_list_layout = maildir++
 mailbox_list_index = yes
 mailbox_list_utf8 = yes
+maildir_copy_with_hardlinks = yes
 
 mail_attribute {
   dict file {