@patm2g
No. In general the digest email is intended to minimize the number of email notifications send by the iTSec plugin.
That said you will benefit most from it while your site is under (brute force) attack.
Note it will only affect email notifications triggered by the Brute Force Protection\404 Detection and\or File Change Detection features.
If there is no active host\user lockout and the last File Change Detection scan did not find any changes the Digest email is not send.
This is controlled by a specific option in the wp_options database table. It’s named itsec_message_queue. No message(s) in the queue means no digest email is send. The message queue is also emptied (initialized) after sending the latest Digest email.
Obviously there is something going wrong in your env that causes the message queue option to contain a file change detection message even when no file changes are detected.
I haven’t seen anyone else reporting a similar issue so I don’t think it’s a bug. Pretty sure this normally works as designed.
dwinden