You can send a custom report via email by following the steps below:
From the left navigation menu, select Reports → More Reports.
Find and select your custom report.
If you pinned the report, select Reports → Custom → your custom report.
In the top-right corner, select [Share].
Select what Format the report should be sent in.
In the Send To field, enter the report recipient's Email Address.
Write a Subject and Message for the email.