On 5 Dec 2017, at 15:32, Gregory Finch <gfinch@ldmltd.ca> wrote:

...

How do I disable the index files, please? …

from https://wiki2.dovecot.org/MailLocation#Index_files

add :INDEX=MEMORY to your mail_location line, ie:

mail_location = maildir:~/Maildir:INDEX=MEMORY

Many thanks!

That works perfectly.

Stroller.